WEBVTT 00:00:00.000 --> 00:00:01.580 The story you think you know about Alexander 00:00:01.580 --> 00:00:04.419 Fleming is usually summed up in three words. 00:00:04.919 --> 00:00:07.299 Happy accident. Right. You know, a forgotten 00:00:07.299 --> 00:00:10.199 petri dish, a stray mold spore, and then boom, 00:00:10.400 --> 00:00:13.099 the entire modern age of medicine just begins. 00:00:13.400 --> 00:00:15.439 It is the most seductive kind of story, isn't 00:00:15.439 --> 00:00:17.579 it? Because it suggests that, you know, genius 00:00:17.579 --> 00:00:21.260 is just luck. And that's deeply comforting. Yeah, 00:00:21.300 --> 00:00:22.859 it makes it seem easy. But if we just reduce 00:00:22.859 --> 00:00:25.600 Fleming's life to that one single accidental 00:00:25.600 --> 00:00:29.449 moment, we miss. We miss everything. We miss 00:00:29.449 --> 00:00:32.750 the decades of rigorous, often ignored critical 00:00:32.750 --> 00:00:35.450 thinking. That thinking is what made him the 00:00:35.450 --> 00:00:37.950 only person in the world ready to recognize what 00:00:37.950 --> 00:00:40.630 that mold actually meant. Absolutely. We are 00:00:40.630 --> 00:00:43.509 talking about the man whose work led to what 00:00:43.509 --> 00:00:45.469 a lot of historians call the single greatest 00:00:45.469 --> 00:00:48.609 victory ever achieved over disease in human history. 00:00:48.869 --> 00:00:51.030 It's hard to argue with that. But if you only 00:00:51.030 --> 00:00:54.149 focus on that 1928 discovery, you're obscuring 00:00:54.149 --> 00:00:57.369 this incredible intellectual journey. really 00:00:57.369 --> 00:01:00.750 two earlier vital contributions he made. He didn't 00:01:00.750 --> 00:01:03.450 just stumble upon penicillin. He was actively 00:01:03.450 --> 00:01:06.329 hunting for something like it. And he was doing 00:01:06.329 --> 00:01:08.230 that based on lessons he learned in the trenches. 00:01:08.590 --> 00:01:12.609 So our deep dive today is all about giving you 00:01:12.609 --> 00:01:15.930 that full complex context of the antibiotic revolution. 00:01:16.189 --> 00:01:18.069 We are going to move way past the simplified 00:01:18.069 --> 00:01:20.730 happy accident myth. And we're using comprehensive 00:01:20.730 --> 00:01:24.890 sources that detail his entire career from his... 00:01:26.060 --> 00:01:28.760 Humble Scottish origins all the way to his knighthood 00:01:28.760 --> 00:01:31.540 and the 1945 Nobel Prize. Which he shared, of 00:01:31.540 --> 00:01:33.519 course, with Howard Florey and Ernst Chain. The 00:01:33.519 --> 00:01:36.260 chemists, yes. So the mission for you, the listener, 00:01:36.439 --> 00:01:38.840 is to walk away with a shortcut to the full, 00:01:38.920 --> 00:01:42.719 nuanced story. We all know the end result. Penicillin 00:01:42.719 --> 00:01:45.359 saved millions of lives. But to really appreciate 00:01:45.359 --> 00:01:47.719 his genius... You have to look back. You have 00:01:47.719 --> 00:01:49.780 to look at two other major pivotal observations. 00:01:50.060 --> 00:01:52.620 One involved critiquing established medical practice 00:01:52.620 --> 00:01:55.739 during a world war. And the other, the discovery 00:01:55.739 --> 00:01:58.859 of a different antimicrobial agent called lysozyme. 00:01:59.040 --> 00:02:00.900 These really paved the way for everything that 00:02:00.900 --> 00:02:02.920 followed. OK, so let's unpack this. To really 00:02:02.920 --> 00:02:07.700 understand Fleming's unique approach to. to bacteriology, 00:02:07.959 --> 00:02:10.759 you have to appreciate his background. He wasn't 00:02:10.759 --> 00:02:12.800 some product of the privileged London academic 00:02:12.800 --> 00:02:16.219 system. No, not at all. He was born in 1881 on 00:02:16.219 --> 00:02:19.460 Lockfield Farm near Darbell in Scotland. It was 00:02:19.460 --> 00:02:21.379 a rural background and it gave him this very 00:02:21.379 --> 00:02:24.400 practical, you know, hands -on approach to solving 00:02:24.400 --> 00:02:26.840 problems. And he started really far from medicine. 00:02:27.420 --> 00:02:29.780 After his initial schooling, he moved to London, 00:02:29.879 --> 00:02:32.479 went to the Royal Polytechnic Institution, and 00:02:32.479 --> 00:02:34.680 even spent four years working in a shipping office. 00:02:34.860 --> 00:02:36.979 Which sounds like the exact opposite of a research 00:02:36.979 --> 00:02:39.580 lab. It really does. It wasn't until his older 00:02:39.580 --> 00:02:42.219 brother, Tom, who was a physician, sort of pushed 00:02:42.219 --> 00:02:44.740 him into medicine after Alexander inherited a 00:02:44.740 --> 00:02:47.639 small sum from an uncle in 1903. That's when 00:02:47.639 --> 00:02:49.939 his path really changed. That inheritance was 00:02:49.939 --> 00:02:52.099 the key. It's what allowed him to enroll at St. 00:02:52.180 --> 00:02:54.060 Mary's Hospital Medical School in Paddington. 00:02:54.199 --> 00:02:57.469 And he turned out to be... A brilliant, if maybe 00:02:57.469 --> 00:03:01.349 an unconventional student. He qualified with 00:03:01.349 --> 00:03:05.590 an MBBS degree with distinction in 1906. But 00:03:05.590 --> 00:03:07.310 the reason he stayed at St. Mary's, the reason 00:03:07.310 --> 00:03:09.550 he got into research in the first place, is one 00:03:09.550 --> 00:03:11.669 of those wonderful, bizarre twists of history. 00:03:11.889 --> 00:03:13.810 It all comes down to the rifle club. The rifle 00:03:13.810 --> 00:03:16.430 club. Yeah, Fleming was a very keen marksman. 00:03:16.469 --> 00:03:19.389 He was a private in the London Scottish Regiment 00:03:19.389 --> 00:03:21.879 of the Volunteer Force. A very valuable member 00:03:21.879 --> 00:03:24.599 of the medical school's rifle team. And the club 00:03:24.599 --> 00:03:26.620 captain was desperate to keep him on the team 00:03:26.620 --> 00:03:28.680 at St. Mary's so they wouldn't lose his shark 00:03:28.680 --> 00:03:31.219 shooting skills. So the captain just suggests, 00:03:31.479 --> 00:03:33.479 hey, why don't you join the research department? 00:03:33.900 --> 00:03:37.240 It was led by Sir Amroth Wright. who was a pioneer 00:03:37.240 --> 00:03:39.800 in vaccine therapy. It's almost comical when 00:03:39.800 --> 00:03:41.400 you think about it. I mean, the fate of modern 00:03:41.400 --> 00:03:44.620 medicine hinged in part on keeping a good shot 00:03:44.620 --> 00:03:46.819 on the rifle team. It's incredible. And he ended 00:03:46.819 --> 00:03:49.080 up thriving there. He got a BSc degree with a 00:03:49.080 --> 00:03:52.699 gold medal in bacteriology in 1908 and became 00:03:52.699 --> 00:03:55.080 Wright's assistant bacteriologist. And this gave 00:03:55.080 --> 00:03:56.819 him a lab. It gave him a place where he could 00:03:56.819 --> 00:03:59.759 finally pursue his own curiosity. And that curiosity 00:03:59.759 --> 00:04:03.699 and that scientific independence, it was really 00:04:03.699 --> 00:04:06.120 forged in fire, World War I. He was commissioned 00:04:06.120 --> 00:04:08.780 as a lieutenant and served the entire war in 00:04:08.780 --> 00:04:11.560 the Royal Army Medical Corps. He spent his time 00:04:11.560 --> 00:04:13.939 at the military hospital at Bologna Surma, which 00:04:13.939 --> 00:04:16.240 was right there near the Western Front. This 00:04:16.240 --> 00:04:19.160 exposure to the sheer brutality of war wounds. 00:04:19.439 --> 00:04:22.740 I mean, these deep, ragged tears contaminated 00:04:22.740 --> 00:04:26.720 with soil, bits of clothing, shrapnel. It was 00:04:26.720 --> 00:04:29.139 the definitive catalyst for his critical thinking. 00:04:29.420 --> 00:04:31.579 He and his colleagues were seeing these horrific 00:04:31.579 --> 00:04:35.689 rates of sepsis and death, even when the And 00:04:35.689 --> 00:04:39.170 that's what led to his first major piece of critical, 00:04:39.329 --> 00:04:42.050 you could even say anti -establishment science. 00:04:42.389 --> 00:04:45.009 Yes. His realization that the prevailing treatment 00:04:45.009 --> 00:04:47.750 dousing these wounds in strong antiseptics was 00:04:47.750 --> 00:04:50.040 actually doing more harm than good. The common 00:04:50.040 --> 00:04:52.120 wisdom back then was just kill all the germs, 00:04:52.259 --> 00:04:54.459 save the patient. They were using things like 00:04:54.459 --> 00:04:57.360 carbolic acid, boric acid, hypochlorite. All 00:04:57.360 --> 00:05:00.220 very harsh chemicals. Fleming's 1917 paper in 00:05:00.220 --> 00:05:02.279 The Lancet wasn't just his opinion. It was a 00:05:02.279 --> 00:05:04.879 systematic, quantified scientific takedown of 00:05:04.879 --> 00:05:06.560 that whole practice. So what did he do? What 00:05:06.560 --> 00:05:08.959 was the experiment? What he did was ingenious 00:05:08.959 --> 00:05:11.939 and very practical. He basically demonstrated 00:05:11.939 --> 00:05:14.720 that in these deep, complex wounds from trench 00:05:14.720 --> 00:05:17.860 warfare, the antiseptic solution simply couldn't 00:05:17.860 --> 00:05:20.300 get deep enough. They couldn't penetrate the 00:05:20.300 --> 00:05:22.420 tissue to reach the bacteria that were hiding 00:05:22.420 --> 00:05:24.839 deep inside, especially the anaerobic bacteria, 00:05:25.180 --> 00:05:28.819 the ones that thrive without oxygen. So the surface 00:05:28.819 --> 00:05:32.339 bacteria might die, but the really deadly pathogens 00:05:32.339 --> 00:05:35.519 deeper in the wound? were effectively untouched. 00:05:35.600 --> 00:05:37.720 They are protected by the body's own tissue. 00:05:37.920 --> 00:05:40.240 Exactly. But here's the really insidious part 00:05:40.240 --> 00:05:42.600 that Fleming proved. OK. The antiseptic solutions, 00:05:42.899 --> 00:05:45.480 because they're just indiscriminate protoplasmic 00:05:45.480 --> 00:05:49.420 poisons, they did easily penetrate and destroy 00:05:49.420 --> 00:05:52.060 the body's own critical defensive mechanisms. 00:05:52.600 --> 00:05:54.379 You're talking about the leukocytes, the white 00:05:54.379 --> 00:05:56.759 blood cells. Can you just elaborate on why destroying 00:05:56.759 --> 00:05:59.480 those was so catastrophic? Absolutely. Leukocytes 00:05:59.480 --> 00:06:01.860 are the body's frontline soldiers. They use a 00:06:01.860 --> 00:06:05.029 process called phagocytosis. They literally engulf 00:06:05.029 --> 00:06:06.709 and destroy pathogens. Oh yeah, they eat them. 00:06:06.810 --> 00:06:09.750 Fleming showed that the common antiseptics, like 00:06:09.750 --> 00:06:13.050 carbolic acid, were incredibly effective at destroying 00:06:13.050 --> 00:06:15.230 these leukocytes. They were just, you know, poisons. 00:06:15.870 --> 00:06:19.529 A diluted antiseptic strong enough to kill surface 00:06:19.529 --> 00:06:22.069 bacteria was often more than strong enough to 00:06:22.069 --> 00:06:24.269 destroy the patient's own biological defenses, 00:06:24.670 --> 00:06:27.629 especially deep in the wound. So if I'm understanding 00:06:27.629 --> 00:06:29.589 this correctly, the antiseptics were killing... 00:06:30.160 --> 00:06:32.639 the only beneficial agents the body was producing, 00:06:32.779 --> 00:06:36.079 while at the same time failing to reach the dangerous 00:06:36.079 --> 00:06:39.100 anaerobic pathogens that were causing the worst 00:06:39.100 --> 00:06:42.160 sepsis. He was essentially saying, you are killing 00:06:42.160 --> 00:06:44.060 the immune system without killing the enemy. 00:06:44.220 --> 00:06:46.740 That is the perfect way to put it. And he quantified 00:06:46.740 --> 00:06:49.879 this. He showed that the ratio of bacteria killed 00:06:49.879 --> 00:06:52.079 by the body's defenses compared to the damage 00:06:52.079 --> 00:06:54.439 done by the antiseptic meant the patient was 00:06:54.439 --> 00:06:57.459 just worse off. So what was his solution? He 00:06:57.459 --> 00:06:59.899 concluded that irrigating with a simple saline 00:06:59.899 --> 00:07:02.259 solution or even just warm water, which didn't 00:07:02.259 --> 00:07:04.579 interfere with the body's natural defenses, was 00:07:04.579 --> 00:07:06.660 often better than using these chemical poisons. 00:07:06.660 --> 00:07:08.560 That's a genuinely revolutionary finding. I mean, 00:07:08.560 --> 00:07:10.000 that should have changed battlefield medicine 00:07:10.000 --> 00:07:13.019 overnight. It should have. And here's the deep 00:07:13.019 --> 00:07:14.939 irony, which kind of foreshadows the rest of 00:07:14.939 --> 00:07:17.959 his career. Despite strong support from his mentor, 00:07:18.180 --> 00:07:21.300 Sir Almroth Wright, most Army physicians just 00:07:21.300 --> 00:07:25.089 kept using the antiseptics. Why? Just... Institutional 00:07:25.089 --> 00:07:28.689 inertia. Institutional inertia is powerful. They'd 00:07:28.689 --> 00:07:31.689 been trained to use them and to stop felt like 00:07:31.689 --> 00:07:34.110 they were just giving up. They didn't trust the 00:07:34.110 --> 00:07:36.550 findings of this relatively junior scientist 00:07:36.550 --> 00:07:39.009 who was arguing that doing less was better than 00:07:39.009 --> 00:07:41.389 the established toxic treatment. So this set 00:07:41.389 --> 00:07:43.990 a pattern for him. Discover something profoundly 00:07:43.990 --> 00:07:47.100 true. publish it rigorously, and then watch the 00:07:47.100 --> 00:07:49.319 medical establishment mostly ignore it. Yes, 00:07:49.360 --> 00:07:51.500 because it challenged the prevailing way of thinking. 00:07:51.740 --> 00:07:54.139 He walked away from World War I with this fundamental 00:07:54.139 --> 00:07:57.220 belief that external chemical warfare against 00:07:57.220 --> 00:08:00.379 bacteria often failed. And the real secret had 00:08:00.379 --> 00:08:03.240 to be finding agents that were selectively toxic. 00:08:03.639 --> 00:08:06.259 Potent enough to kill the germ, but gentle enough 00:08:06.259 --> 00:08:08.540 to leave the body's cells and its natural defenses 00:08:08.540 --> 00:08:11.779 unharmed. And that philosophical pivot Forged 00:08:11.779 --> 00:08:14.199 in the trauma of the Western Front, that leads 00:08:14.199 --> 00:08:17.259 us directly into his next big discovery. So after 00:08:17.259 --> 00:08:20.160 returning to St. Mary's in 1918, Fleming was 00:08:20.160 --> 00:08:22.439 relentless. He was hunting for these naturally 00:08:22.439 --> 00:08:25.079 occurring, non -toxic antibacterial substances. 00:08:25.480 --> 00:08:28.040 He just knew the external poisons were a dead 00:08:28.040 --> 00:08:30.939 end. The solution had to be biological. And this 00:08:30.939 --> 00:08:32.960 brings us to the famous details about his lab. 00:08:33.259 --> 00:08:35.620 The sources, they all mention his productive 00:08:35.620 --> 00:08:38.899 untidiness. A key environmental factor, yes. 00:08:39.139 --> 00:08:41.500 His colleague V .D. Allison even noted that if 00:08:41.500 --> 00:08:43.440 Fleming had been as tidy as he thought I was, 00:08:43.600 --> 00:08:45.679 he would not have made his two great discoveries. 00:08:46.059 --> 00:08:48.360 His chaotic benches allowed for open plates, 00:08:48.580 --> 00:08:51.519 for dust, for unexpected contamination, which 00:08:51.519 --> 00:08:53.659 in his case was really the engine of discovery. 00:08:54.019 --> 00:08:56.700 That lack of tidiness led directly to the first 00:08:56.700 --> 00:08:59.700 great serendipity of his post -war career in 00:08:59.700 --> 00:09:03.350 late... 1921. The discovery of lysozyme. Fleming 00:09:03.350 --> 00:09:05.570 was handling some agar plates that were contaminated 00:09:05.570 --> 00:09:08.110 with bacteria from the air, which was a constant 00:09:08.110 --> 00:09:10.629 problem in London labs back then. And then he 00:09:10.629 --> 00:09:13.710 got a cold. He contracted acute cordaza. And 00:09:13.710 --> 00:09:15.669 while he was handling one of these contaminated 00:09:15.669 --> 00:09:18.690 plates, he deliberately added a bit of his own 00:09:18.690 --> 00:09:21.389 nasal mucus to the culture. And that intentional 00:09:21.389 --> 00:09:24.590 action is so key. It shows he was already actively 00:09:24.590 --> 00:09:27.049 looking for antibacterial properties in bodily 00:09:27.049 --> 00:09:30.070 fluids. This wasn't an accident. He noted it 00:09:30.070 --> 00:09:33.309 right in his lab notebook on November 21st, 1921, 00:09:33.529 --> 00:09:36.850 linking the sample to himself. Staphyloid caucus 00:09:36.850 --> 00:09:40.129 from AF's nose. And the observation he made was 00:09:40.129 --> 00:09:42.409 quick and dramatic. It must have reminded him 00:09:42.409 --> 00:09:45.669 of his work on antiseptics, but in reverse. He 00:09:45.669 --> 00:09:48.710 saw a clear, transparent circle. about a centimeter 00:09:48.710 --> 00:09:51.409 across, all around the area where the mucus had 00:09:51.409 --> 00:09:53.889 touched the agar. Inside that circle, the bacteria 00:09:53.889 --> 00:09:56.139 were soteriolized. They were destroyed. And beyond 00:09:56.139 --> 00:09:59.179 that zone, you just had normal, opaque bacterial 00:09:59.179 --> 00:10:01.340 growth. You realize right away he'd found an 00:10:01.340 --> 00:10:03.039 enzyme, something that was breaking down the 00:10:03.039 --> 00:10:05.940 bacteria. Yes. And to verify it, he needed to 00:10:05.940 --> 00:10:08.580 test other biological secretions. And this is 00:10:08.580 --> 00:10:11.139 where that famous and, frankly, kind of absurd 00:10:11.139 --> 00:10:13.379 anecdote comes from. He confirmed that saliva 00:10:13.379 --> 00:10:16.379 and tears also contained the substance, but tears 00:10:16.379 --> 00:10:18.580 were easier to get in bulk. Which led to his 00:10:18.580 --> 00:10:21.440 campaign of using his coworkers and the lab attendants 00:10:21.440 --> 00:10:25.039 as, let's say, involuntary tear donors. Imagine. 00:10:25.100 --> 00:10:28.379 that scene allison recalls that for weeks they 00:10:28.379 --> 00:10:31.360 were pressing colleagues into service and since 00:10:31.360 --> 00:10:33.600 you can't just cry on demand they had to get 00:10:33.600 --> 00:10:36.419 creative the source says Many were the lemons 00:10:36.419 --> 00:10:39.059 we used after the failure of onions to produce 00:10:39.059 --> 00:10:42.299 a flow of tears. That is just fantastic. I love 00:10:42.299 --> 00:10:45.279 the image of this world -changing discovery requiring 00:10:45.279 --> 00:10:47.580 a team of scientists crying over beakers, smelling 00:10:47.580 --> 00:10:50.240 onions, or having lemon juice squeezed near their 00:10:50.240 --> 00:10:52.519 eyes. And the detail that the lab attendants 00:10:52.519 --> 00:10:55.080 were paid three pence for each contribution just 00:10:55.080 --> 00:10:57.360 brings the whole scene to life. It really does. 00:10:57.460 --> 00:10:59.919 It elevates it from just a dry scientific fact 00:10:59.919 --> 00:11:03.129 to a story about human curiosity. motivated by 00:11:03.129 --> 00:11:05.710 a small wage. Exactly. And this persistent testing 00:11:05.710 --> 00:11:08.169 proved the agent was widely distributed in all 00:11:08.169 --> 00:11:11.210 sorts of human fluids, sputum, blood, even in 00:11:11.210 --> 00:11:13.149 egg whites. It was a component of our innate 00:11:13.149 --> 00:11:16.049 immunity. So by 1922, he names the substance 00:11:16.049 --> 00:11:19.259 lysozyme. He publishes his findings. He even 00:11:19.259 --> 00:11:21.379 names the bacteria he used as his litmus test. 00:11:21.879 --> 00:11:24.320 Micrococcus lysodeicticus, which means lysis 00:11:24.320 --> 00:11:27.580 indicator. Lysozyme was fundamentally the world's 00:11:27.580 --> 00:11:30.200 first antimicrobial protein ever discovered. 00:11:30.600 --> 00:11:33.059 So what's the mechanism? How does it work? So 00:11:33.059 --> 00:11:35.779 the enzyme breaks down the peptidoglycan layer. 00:11:36.159 --> 00:11:39.000 That's the mesh -like substance that forms the 00:11:39.000 --> 00:11:41.419 bacterial cell wall, especially in what we call 00:11:41.419 --> 00:11:44.340 gram -positive bacteria. This causes the cell 00:11:44.340 --> 00:11:46.580 to just burst. This should have been heralded 00:11:46.580 --> 00:11:49.299 as a massive immunological breakthrough. But 00:11:49.299 --> 00:11:51.340 this is where history repeats itself. Right. 00:11:51.419 --> 00:11:54.190 Just like the World War I findings. The discovery 00:11:54.190 --> 00:11:57.090 of lysozyme was met with a scientific shoulder 00:11:57.090 --> 00:11:59.529 shrug. Why? Because of its immediate therapeutic 00:11:59.529 --> 00:12:02.850 failure. Lysozyme, while it was potent, was only 00:12:02.850 --> 00:12:05.009 effective against relatively harmless bacteria 00:12:05.009 --> 00:12:08.190 like that microcaucus itself or small counts 00:12:08.190 --> 00:12:11.490 of other environmental germs. It didn't effectively 00:12:11.490 --> 00:12:15.509 kill the major deep -seated pathogens like virulent... 00:12:16.419 --> 00:12:18.559 staphylococci or streptococci that cause the 00:12:18.559 --> 00:12:21.799 most fatal diseases. So he'd found a great antibacterial 00:12:21.799 --> 00:12:23.879 agent, but it was fighting the equivalent of 00:12:23.879 --> 00:12:27.080 what scientific skirmishes, not the actual war. 00:12:27.240 --> 00:12:29.059 That is a perfect way to phrase it. V .D. Allison 00:12:29.059 --> 00:12:31.220 confirmed the cold reception when Fleming presented 00:12:31.220 --> 00:12:34.460 the paper. He recalled, no questions asked and 00:12:34.460 --> 00:12:37.279 no discussion. A clear sign the medical community 00:12:37.279 --> 00:12:39.279 just thought it was irrelevant because it couldn't 00:12:39.279 --> 00:12:41.360 cure pneumonia right away. Right. So he discovers 00:12:41.360 --> 00:12:43.720 this fundamental mechanism of innate immunity, 00:12:44.059 --> 00:12:47.559 a precursor to all future antibiotics, and he's 00:12:47.559 --> 00:12:50.379 completely ignored. But for Fleming, this setback 00:12:50.379 --> 00:12:53.080 didn't stop him. It just solidified his belief 00:12:53.080 --> 00:12:56.320 that highly selective, non -toxic natural agents 00:12:56.320 --> 00:12:59.679 did exist. He just had to find one with a broader 00:12:59.679 --> 00:13:02.639 range of activity. So Fleming is back in his 00:13:02.639 --> 00:13:04.840 lab. He's now professor of bacteriology at the 00:13:04.840 --> 00:13:06.860 University of London, and he's still hunting 00:13:06.860 --> 00:13:09.899 for these antibacterial substances. He's guided 00:13:09.899 --> 00:13:11.899 by the failures of the war and the limitations 00:13:11.899 --> 00:13:15.320 of lysozyme. He's looking for that gentle, natural 00:13:15.320 --> 00:13:18.860 killer. The year is 1928. He's doing research 00:13:18.860 --> 00:13:21.539 on the variation of Staphylococcus aureus strains. 00:13:21.820 --> 00:13:24.259 This was a follow -up to some work by Joseph 00:13:24.259 --> 00:13:26.220 Warwick Bigger. And what was he trying to understand? 00:13:26.759 --> 00:13:29.000 He wanted to see how these very common, very 00:13:29.000 --> 00:13:31.200 dangerous bacteria changed their physical and 00:13:31.200 --> 00:13:33.659 biological properties. And then comes the legendary 00:13:33.659 --> 00:13:37.360 moment, September 3rd, 1928. Fleming gets back 00:13:37.360 --> 00:13:39.320 to St. Mary's after a summer holiday in Suffolk. 00:13:39.440 --> 00:13:43.159 He walks into his famously untidy lab and finds 00:13:43.159 --> 00:13:45.279 this stack of culture plates he had just left 00:13:45.279 --> 00:13:48.379 inoculated on a bench. And on one of those plates, 00:13:48.500 --> 00:13:50.840 he noticed the predictable thing, contamination. 00:13:51.600 --> 00:13:55.159 But this contamination... was a fungus, a mold. 00:13:55.480 --> 00:13:58.039 It had clearly floated in through an open window 00:13:58.039 --> 00:14:00.799 from the street below. He later realized it actually 00:14:00.799 --> 00:14:03.100 came from the lab of a colleague, Charles J. 00:14:03.159 --> 00:14:05.559 Latouche, who was working directly downstairs. 00:14:06.080 --> 00:14:08.460 But the core observation, which was informed 00:14:08.460 --> 00:14:11.139 by that lysozyme discovery seven years earlier, 00:14:11.320 --> 00:14:14.100 was the difference between this and just any 00:14:14.100 --> 00:14:16.840 old contamination. That's the whole point. This 00:14:16.840 --> 00:14:19.570 is why it wasn't just luck. Any other scientist 00:14:19.570 --> 00:14:21.889 would have just tossed the plate. But Fleming, 00:14:21.950 --> 00:14:24.289 he immediately saw that the colonies of Staphylococci 00:14:24.289 --> 00:14:26.169 surrounding the fungus were destroyed. They were 00:14:26.169 --> 00:14:28.389 lysos, just like his micrococcus had been by 00:14:28.389 --> 00:14:31.009 lysozyme. And his now famous, almost comically 00:14:31.009 --> 00:14:34.169 subdued reaction was just, that's funny. He showed 00:14:34.169 --> 00:14:36.330 it to his former assistant, Merlin Price, who 00:14:36.330 --> 00:14:38.110 recognized the pattern immediately and said, 00:14:38.230 --> 00:14:40.539 that's how you discovered lysozyme. It was a 00:14:40.539 --> 00:14:43.580 confirmation that his power of observation, honed 00:14:43.580 --> 00:14:45.960 by all his earlier work, was what mattered, not 00:14:45.960 --> 00:14:49.000 the mold spore itself. So he grows the mold in 00:14:49.000 --> 00:14:52.120 a pure culture. He sees that the culture broth 00:14:52.120 --> 00:14:55.500 has this powerful antibacterial substance that 00:14:55.500 --> 00:14:58.720 was incredibly gentle on human cells. And the 00:14:58.720 --> 00:15:01.159 mold was identified as Penicillium Rubens, although 00:15:01.159 --> 00:15:03.860 it took botanists decades to finally settle on 00:15:03.860 --> 00:15:06.179 that name. He initially just called the active 00:15:06.179 --> 00:15:09.299 ingredient mold juice, or the inhibitor. It wasn't 00:15:09.299 --> 00:15:12.620 until March 7th, 1929, that he formally published 00:15:12.620 --> 00:15:15.340 his findings and gave it the name penicillin. 00:15:15.419 --> 00:15:18.899 The next crucial step was figuring out its specificity, 00:15:18.899 --> 00:15:20.720 and this is where the real breakthrough was. 00:15:21.700 --> 00:15:24.379 Penicillin's range of action was perfect. What 00:15:24.379 --> 00:15:26.500 did it affect? He found it affected major gram 00:15:26.500 --> 00:15:29.679 -positive pathogens, Staphylococci, Stryptococci, 00:15:29.679 --> 00:15:32.200 which causes scarlet fever, Pneumococci for pneumonia, 00:15:32.820 --> 00:15:35.700 Meningococci for meningitis, and the bacteria 00:15:35.700 --> 00:15:38.340 that causes diphtheria. We should probably pause 00:15:38.340 --> 00:15:40.600 there and clarify that distinction. When he's 00:15:40.600 --> 00:15:43.039 talking about gram -positive versus gram -negative, 00:15:43.080 --> 00:15:44.519 what does that actually mean for how the drug 00:15:44.519 --> 00:15:47.559 works? It's a crucial technical point. But to 00:15:47.559 --> 00:15:50.139 simplify, bacteria are classified based on the 00:15:50.139 --> 00:15:52.480 structure of their cell walls, which affects 00:15:52.480 --> 00:15:54.500 how they react to something called the gram stain. 00:15:55.039 --> 00:15:58.399 Okay. Gram -positive bacteria have a very thick 00:15:58.399 --> 00:16:01.120 layer of that peptidoglycan, that mesh -like 00:16:01.120 --> 00:16:03.919 structure we mentioned earlier. And penicillin 00:16:03.919 --> 00:16:06.940 is a beta -lactam antibiotic. Its whole mechanism 00:16:06.940 --> 00:16:10.480 is to specifically stop the synthesis of that 00:16:10.480 --> 00:16:13.120 peptoglycan layer. So it stops the bacteria from 00:16:13.120 --> 00:16:15.100 building a stable cell wall. It's a structural 00:16:15.100 --> 00:16:17.980 attack. Exactly. It selectively targets that 00:16:17.980 --> 00:16:20.679 vulnerable, thick wall of the gram -positive 00:16:20.679 --> 00:16:23.139 strains. And gram -negative. Gram -negative bacteria 00:16:23.139 --> 00:16:26.299 have a much thinner peptidoglycan layer, and 00:16:26.299 --> 00:16:28.639 it's often protected by an outer lipid membrane. 00:16:29.419 --> 00:16:31.620 That protective barrier makes them much less 00:16:31.620 --> 00:16:33.980 susceptible to penicillin. Which is why he noted 00:16:33.980 --> 00:16:36.039 that penicillin did not affect gram -negative 00:16:36.039 --> 00:16:38.320 bacteria, like the ones that cause typhoid or 00:16:38.320 --> 00:16:40.899 paradyphoid fever. Deeply ironic, because those 00:16:40.899 --> 00:16:43.620 were the exact diseases he was trying to cure 00:16:43.620 --> 00:16:45.940 at the time, yet he had just stumbled upon a 00:16:45.940 --> 00:16:48.399 weapon against most of the other major historical 00:16:48.399 --> 00:16:50.600 killers. And there was one interesting exception, 00:16:50.740 --> 00:16:53.899 wasn't there? A fascinating one, he noted. Neisseria 00:16:53.899 --> 00:16:56.820 gonorrhea, the bacteria that causes gonorrhea. 00:16:57.059 --> 00:16:59.830 It is gram -negative. but for structural reasons, 00:17:00.090 --> 00:17:02.970 its outer membrane is uniquely permeable to penicillin. 00:17:02.990 --> 00:17:05.970 So this profile, highly effective against major 00:17:05.970 --> 00:17:09.329 diseases, incredibly gentle on human cells, and 00:17:09.329 --> 00:17:12.390 specific in its attack, this was the breakthrough. 00:17:12.730 --> 00:17:15.109 He recognized its medical potential immediately, 00:17:15.430 --> 00:17:19.150 unlike lysozyme, but he ran into a wall, and 00:17:19.150 --> 00:17:21.710 that wall was chemistry. So penicillin had the 00:17:21.710 --> 00:17:24.250 biological power, but its early history just 00:17:24.250 --> 00:17:26.930 mirrors the rejection of his OWI work and the 00:17:26.930 --> 00:17:29.109 dismissal of lysozyme. The reception from the 00:17:29.109 --> 00:17:32.009 scientific community was, what, ice cold? Completely. 00:17:32.089 --> 00:17:34.210 He presented his findings to the Medical Research 00:17:34.210 --> 00:17:37.130 Club in 1929, but the title itself, A Medium 00:17:37.130 --> 00:17:39.819 for the Isolation of Pfeiffer's Bacillus, clearly 00:17:39.819 --> 00:17:42.099 buried the lead on the whole juice. Not exactly 00:17:42.099 --> 00:17:44.420 a blockbuster title. Not at all. And the sources 00:17:44.420 --> 00:17:46.920 confirm this crushing lack of interest. Henry 00:17:46.920 --> 00:17:48.660 Dale, who was the chair of the meeting, a very 00:17:48.660 --> 00:17:51.140 respected figure, he later confessed he didn't 00:17:51.140 --> 00:17:53.660 sense any striking point of importance. And his 00:17:53.660 --> 00:17:56.480 1929 publication in the British Journal of Experimental 00:17:56.480 --> 00:17:59.140 Pathology also just went largely unnoticed. The 00:17:59.140 --> 00:18:01.359 crucial problem, as you said, wasn't the biology. 00:18:01.480 --> 00:18:03.740 The effectiveness was clear. It was the chemistry. 00:18:04.319 --> 00:18:07.119 Fleming was an excellent bacteriologist, but 00:18:07.119 --> 00:18:09.759 he just didn't have the chemical expertise to 00:18:09.759 --> 00:18:12.380 turn this mold juice into a stable therapeutic 00:18:12.380 --> 00:18:15.440 compound. He faced two huge technical challenges, 00:18:15.500 --> 00:18:17.940 right? Two interconnected, immense challenges. 00:18:18.380 --> 00:18:22.440 First, producing it in massive industrial quantities. 00:18:22.799 --> 00:18:25.460 That required sophisticated fermentation techniques 00:18:25.460 --> 00:18:27.839 he just didn't have. And the second? Chemical 00:18:27.839 --> 00:18:31.420 purification. The substance was incredibly labile. 00:18:31.660 --> 00:18:34.670 Let's define labile here. because it's a critical 00:18:34.670 --> 00:18:37.109 concept for understanding why there was a decade 00:18:37.109 --> 00:18:39.029 -long delay. Well, bile just means chemically 00:18:39.029 --> 00:18:41.970 unstable, easily destroyed. Early penicillin 00:18:41.970 --> 00:18:44.890 was notoriously unstable. If you left the culture 00:18:44.890 --> 00:18:47.509 broth out, the active compound would break down 00:18:47.509 --> 00:18:49.990 rapidly at room temperature. And worse for trying 00:18:49.990 --> 00:18:52.130 to use it as a medicine, it was destroyed by 00:18:52.130 --> 00:18:55.109 stomach acid. Which made taking it orally impossible. 00:18:55.529 --> 00:18:57.750 So if you try to purify it, it degrades. If you 00:18:57.750 --> 00:18:59.609 try to give it as a pill, it's destroyed before 00:18:59.609 --> 00:19:02.369 it even reaches the bloodstream. That's a profound 00:19:02.369 --> 00:19:05.529 technical barrier. And Fleming tried. He collaborated 00:19:05.529 --> 00:19:08.190 with biochemists like Harold Ray Strick, but 00:19:08.190 --> 00:19:10.930 they all struggled with the purification. Ray 00:19:10.930 --> 00:19:13.069 Strick eventually concluded it was too unstable 00:19:13.069 --> 00:19:15.809 and too difficult to purify, and he basically 00:19:15.809 --> 00:19:18.970 gave up. So the substance just languished largely 00:19:18.970 --> 00:19:21.470 forgotten in the 1930s. That's how one source 00:19:21.470 --> 00:19:24.400 put it. Fleming kept the mold alive. He published 00:19:24.400 --> 00:19:27.000 on methods to assess its effectiveness. But the 00:19:27.000 --> 00:19:30.039 sheer chemical impossibility just prevented any 00:19:30.039 --> 00:19:33.240 mass application. The depth of his disappointment 00:19:33.240 --> 00:19:35.920 must have been immense. At the Second International 00:19:35.920 --> 00:19:39.380 Congress of Microbiology in 1936, Fleming spoke 00:19:39.380 --> 00:19:41.599 about penicillin's medical importance. And V 00:19:41.599 --> 00:19:44.380 .D. Allison noted that no one believed him. The 00:19:44.380 --> 00:19:46.400 discussion was minimal. It was almost universally 00:19:46.400 --> 00:19:49.990 seen as just a laboratory curiosity. Useful for 00:19:49.990 --> 00:19:52.230 differentiating bacteria in a dish, but not for 00:19:52.230 --> 00:19:54.329 treating patients. But he never truly gave up 00:19:54.329 --> 00:19:56.930 on it. His notebooks show he kept trying, experimenting 00:19:56.930 --> 00:19:59.230 with different media to improve production as 00:19:59.230 --> 00:20:02.069 late as 1939. But the chemical puzzle was just 00:20:02.069 --> 00:20:05.109 too big for a single bacteriology lab. And that's 00:20:05.109 --> 00:20:08.250 why the focus finally shifts in 1938 to Oxford 00:20:08.250 --> 00:20:10.569 and to the collaboration that would change everything. 00:20:11.049 --> 00:20:13.049 This is where Howard Flory, the pathologist, 00:20:13.269 --> 00:20:16.069 and Ernst Chain, the brilliant biochemist, enter 00:20:16.069 --> 00:20:18.910 the story at the Sir William Dunn School of Pathology. 00:20:19.029 --> 00:20:22.470 Chain was interested in naturally occurring antibacterial 00:20:22.470 --> 00:20:25.630 substances, and he decided to revisit Fleming's 00:20:25.630 --> 00:20:28.269 decade -old paper. Chain was the real driving 00:20:28.269 --> 00:20:30.630 force behind the isolation and purification. 00:20:30.910 --> 00:20:34.089 He was an intense, skeptical chemist. And there's 00:20:34.089 --> 00:20:36.589 that fantastic anecdote when Fleming decided 00:20:36.589 --> 00:20:38.829 to visit the Oxford team after they published 00:20:38.829 --> 00:20:41.869 their first promising results in 1940. What did 00:20:41.869 --> 00:20:44.289 Chain say? Upon hearing of the impending visit, 00:20:44.450 --> 00:20:47.170 he famously remarked, Good God, I thought he 00:20:47.170 --> 00:20:49.930 was dead. Wow. That really encapsulates just 00:20:49.930 --> 00:20:52.309 how forgotten Fleming's work had become. It does. 00:20:52.430 --> 00:20:54.750 The Oxford team, they were backed by strong resources 00:20:54.750 --> 00:20:56.569 and they had a completely different approach. 00:20:56.809 --> 00:20:59.569 Their success was a triumph of teamwork and applied 00:20:59.569 --> 00:21:02.309 chemistry. They were the ones who turned Fleming's 00:21:02.309 --> 00:21:04.890 concept into a clinical reality. And what were 00:21:04.890 --> 00:21:07.529 the specific technical breakthroughs? A few key 00:21:07.529 --> 00:21:10.890 ones. Edward Abraham proposed the correct but 00:21:10.890 --> 00:21:14.710 highly unstable molecular structure. a cyclic 00:21:14.710 --> 00:21:18.210 formation known as the wallactum ring. This structure 00:21:18.210 --> 00:21:21.309 is the business end of penicillin, but it's incredibly 00:21:21.309 --> 00:21:23.849 volatile, which explains the lability Fleming 00:21:23.849 --> 00:21:25.990 saw. But the real breakthrough for making it 00:21:25.990 --> 00:21:28.769 stable came from Norman Heatley. He's often the 00:21:28.769 --> 00:21:32.170 unsung hero. Absolutely. Heatley devised a simple 00:21:32.170 --> 00:21:34.880 but revolutionary technique. He suggested transferring 00:21:34.880 --> 00:21:37.259 the active ingredient from the acidic solvent 00:21:37.259 --> 00:21:40.119 they were using back into water just by changing 00:21:40.119 --> 00:21:42.859 the acidity, or the pH. That simple pH trick 00:21:42.859 --> 00:21:45.460 transformed the process. It did. It allowed them 00:21:45.460 --> 00:21:47.940 to extract and stabilize the active ingredient, 00:21:48.200 --> 00:21:51.519 and it yielded this yellow, stable powder. By 00:21:51.519 --> 00:21:54.539 mid -1942, they had produced the first stable, 00:21:54.700 --> 00:21:57.640 pure penicillin compound. Heatley's technique 00:21:57.640 --> 00:22:00.059 was so vital, he later became famous for the 00:22:00.059 --> 00:22:02.720 Heatley unit, a standardized measure of penicillin 00:22:02.720 --> 00:22:05.059 potency. So the discovery suddenly had a practical 00:22:05.059 --> 00:22:07.319 physical form. Now, let's go back to the clinical 00:22:07.319 --> 00:22:09.680 evidence, because even Fleming's earliest attempts 00:22:09.680 --> 00:22:11.839 foreshadowed both the drug's potential and its 00:22:11.839 --> 00:22:14.279 limitations. Fleming's very first clinical trial 00:22:14.279 --> 00:22:17.579 in 1929 was, ironically, a complete failure. 00:22:17.859 --> 00:22:20.470 Who did he treat? He treated his research scholar, 00:22:20.630 --> 00:22:23.650 Stuart Craddock, who had severe sinusitis. The 00:22:23.650 --> 00:22:25.470 treatment failed because Craddock's infection 00:22:25.470 --> 00:22:28.529 was caused by Haemophilus influenzae, a gram 00:22:28.529 --> 00:22:31.049 -negative bacterium that Fleming already knew 00:22:31.049 --> 00:22:33.670 was unsusceptible to penicillin. So that early 00:22:33.670 --> 00:22:36.130 failure probably contributed to the decade of 00:22:36.130 --> 00:22:38.650 skepticism. It may have. But the first successful 00:22:38.650 --> 00:22:41.150 clinical use actually belongs to Cecil George 00:22:41.150 --> 00:22:44.029 Payne, a pathologist in Sheffield who was one 00:22:44.029 --> 00:22:45.809 of Fleming's former students. What did he do? 00:22:46.009 --> 00:22:49.480 In 1930, Payne used the... raw mold broth to 00:22:49.480 --> 00:22:52.920 successfully cure serious eye infections conjunctivitis 00:22:52.920 --> 00:22:56.019 in one adult and three infants with neonatal 00:22:56.019 --> 00:22:58.799 conjunctivitis. These were small scale, topical, 00:22:58.880 --> 00:23:01.619 but they were successful. But the real global 00:23:01.619 --> 00:23:03.700 turning point, the moment the public and the 00:23:03.700 --> 00:23:06.140 government really took notice, was the case of 00:23:06.140 --> 00:23:09.609 Harry Lambert in August 1942. Lambert was an 00:23:09.609 --> 00:23:11.869 associate of Fleming's brother. He was admitted 00:23:11.869 --> 00:23:14.490 to St. Mary's with life -threatening streptococcal 00:23:14.490 --> 00:23:17.250 meningitis. Fleming first used sulfonamides, 00:23:17.369 --> 00:23:19.950 the chemical miracle drugs of the 30s, but Lambert 00:23:19.950 --> 00:23:22.970 was rapidly deteriorating. He was dying. He was. 00:23:23.069 --> 00:23:26.390 So Fleming, knowing this, desperately requested 00:23:26.390 --> 00:23:29.349 the isolated, purified sample from Flory's lab 00:23:29.349 --> 00:23:31.650 in Oxford, which had only just been stabilized. 00:23:32.599 --> 00:23:34.799 He confirmed the bacteria were susceptible and 00:23:34.799 --> 00:23:37.160 then administered the purified sample directly 00:23:37.160 --> 00:23:40.559 into Lambert's spinal canal. Bypassing the blood 00:23:40.559 --> 00:23:42.940 -brain barrier. Exactly. And the results were 00:23:42.940 --> 00:23:46.039 nothing short of miraculous. Lambert showed improvement 00:23:46.039 --> 00:23:48.420 the very next day and was completely recovered 00:23:48.420 --> 00:23:51.380 within a week. That was the moment. The moment 00:23:51.380 --> 00:23:54.099 the laboratory curiosity became a systemic, life 00:23:54.099 --> 00:23:57.180 -saving drug. And Fleming published this astounding 00:23:57.180 --> 00:24:01.119 clinical case in The Lancet in 1943. That case, 00:24:01.359 --> 00:24:03.880 happening in the middle of a war, convinced the 00:24:03.880 --> 00:24:06.200 British Ministry of Health. The Penicillin Committee 00:24:06.200 --> 00:24:10.059 was formed in 1943, with Flory, Chain, and Fleming 00:24:10.059 --> 00:24:12.740 leading the charge for mass production. And because 00:24:12.740 --> 00:24:14.779 Britain was under constant threat of bombing, 00:24:14.980 --> 00:24:16.880 the mass production efforts were strategically 00:24:16.880 --> 00:24:19.299 moved to a collaboration with American companies. 00:24:19.519 --> 00:24:22.079 And the scale -up was just transformative. The 00:24:22.079 --> 00:24:24.579 drug was reserved exclusively for Allied forces. 00:24:24.839 --> 00:24:27.519 The logistics were so successful that by D -Day 00:24:27.519 --> 00:24:30.460 in 1944, enough penicillin had been produced 00:24:30.460 --> 00:24:33.640 to treat every single wounded Allied soldier. 00:24:33.880 --> 00:24:36.400 It fundamentally changed the definition of a 00:24:36.400 --> 00:24:39.180 survivable war worm. So this collective success 00:24:39.180 --> 00:24:43.140 was acknowledged globally. Fleming, Howard Florey, 00:24:43.140 --> 00:24:46.460 and Ernst Chain jointly received the 1945 Nobel 00:24:46.460 --> 00:24:49.359 Prize in Physiology or Medicine. And Fleming 00:24:49.359 --> 00:24:51.529 had been knighted the year before. So what does 00:24:51.529 --> 00:24:54.309 all this mean for the public perception? The 00:24:54.309 --> 00:24:56.269 massive media coverage of these life -saving 00:24:56.269 --> 00:24:58.569 successes, especially the Harry Lambert case, 00:24:58.730 --> 00:25:01.990 it cemented this huge public profile for Fleming. 00:25:02.220 --> 00:25:04.599 And it created what he himself called the Fleming 00:25:04.599 --> 00:25:06.420 myth. But why did that happen? Why did he get 00:25:06.420 --> 00:25:07.920 all the credit? The creation of the myth was 00:25:07.920 --> 00:25:10.319 really an artifact of professional ethics during 00:25:10.319 --> 00:25:13.819 wartime. Flory, a very private academic, strictly 00:25:13.819 --> 00:25:16.240 prohibited his Oxford team from seeking media 00:25:16.240 --> 00:25:18.920 coverage. He was afraid of being seen as self 00:25:18.920 --> 00:25:20.799 -promotional, especially with patients' lives 00:25:20.799 --> 00:25:23.480 on the line. So as a result, only Fleming, who 00:25:23.480 --> 00:25:26.299 was already a figure in London society, was widely 00:25:26.299 --> 00:25:29.079 quoted and photographed. And the public and the 00:25:29.079 --> 00:25:31.500 press just concluded he was solely responsible 00:25:31.500 --> 00:25:34.000 for the entire thing, from discovery all the 00:25:34.000 --> 00:25:36.740 way to drug development. Fleming felt this was 00:25:36.740 --> 00:25:39.339 profoundly unjust to his collaborators. He was 00:25:39.339 --> 00:25:41.829 consistently modest about it, right? Very. He 00:25:41.829 --> 00:25:44.809 routinely praised Flory and Chain, acknowledging 00:25:44.809 --> 00:25:47.809 that they were the ones who transformed his laboratory 00:25:47.809 --> 00:25:51.529 curiosity into a practical drug. His humility 00:25:51.529 --> 00:25:55.130 was genuine. This collaborative, multidisciplinary 00:25:55.130 --> 00:25:58.210 complexity. It's captured in a famous quote from 00:25:58.210 --> 00:26:00.470 Henry Harris in 1998, which I think just perfectly 00:26:00.470 --> 00:26:03.009 sums it all up. What's the quote? Without Fleming, 00:26:03.029 --> 00:26:06.369 no Chain. Without Chain, no Flory. Without Flory, 00:26:06.390 --> 00:26:09.200 no Heatley. Without Heatley, no penicillin. That's 00:26:09.200 --> 00:26:11.400 perfect. It shows it required the dreamer, the 00:26:11.400 --> 00:26:13.460 chemist, the pharmacologist, and the technician 00:26:13.460 --> 00:26:16.720 to complete the revolution. Before we move on 00:26:16.720 --> 00:26:18.559 to his final warning, we really have to address 00:26:18.559 --> 00:26:20.619 the most persistent piece of fictional history 00:26:20.619 --> 00:26:23.640 about Fleming. Ah, the Churchill fable. Yes. 00:26:24.180 --> 00:26:27.759 This popular widespread story claims Fleming's 00:26:27.759 --> 00:26:30.019 father saved a young Winston Churchill from drowning. 00:26:30.180 --> 00:26:32.859 And then in gratitude, Churchill's father paid 00:26:32.859 --> 00:26:35.619 for Alexander Fleming's entire education. Total 00:26:35.619 --> 00:26:38.220 fiction. Our sources confirm it's a wondrous 00:26:38.220 --> 00:26:40.740 fable. Fleming himself denied it repeatedly, 00:26:40.940 --> 00:26:44.079 including in a 1945 letter to a colleague. His 00:26:44.079 --> 00:26:45.980 education was paid for by his older brother. 00:26:46.410 --> 00:26:48.369 and that inheritance from his uncle. And there's 00:26:48.369 --> 00:26:50.049 a second version of the fable, a more recent 00:26:50.049 --> 00:26:52.230 one, that Fleming himself saved Churchill during 00:26:52.230 --> 00:26:54.549 the war. Also false. Churchill did get pneumonia 00:26:54.549 --> 00:26:58.130 in Carthage in Tunisia in 1943. His physician, 00:26:58.269 --> 00:27:00.990 Lord Moran, treated him successfully not with 00:27:00.990 --> 00:27:04.289 penicillin, but with the sulfonamide drug sulfapyridine, 00:27:04.349 --> 00:27:08.190 often known by its research code MNB -693. Churchill 00:27:08.190 --> 00:27:12.460 called it this admirable MNB. It's amazing how 00:27:12.460 --> 00:27:14.680 much harder a good story sticks than the mundane 00:27:14.680 --> 00:27:17.059 historical facts. It truly is. But moving away 00:27:17.059 --> 00:27:19.140 from these fables, we arrive at what is arguably 00:27:19.140 --> 00:27:21.519 Fleming's single most important and tragically 00:27:21.519 --> 00:27:24.200 ignored contribution to modern medicine. His 00:27:24.200 --> 00:27:27.359 early, chilling, and spot -on warning about antibiotic 00:27:27.359 --> 00:27:30.829 resistance. This needs deep focus. Fleming discovered 00:27:30.829 --> 00:27:33.269 the mechanism of resistance very early on, during 00:27:33.269 --> 00:27:35.930 his initial experiments in the 1930s. How did 00:27:35.930 --> 00:27:38.509 he figure it out? He observed that if you exposed 00:27:38.509 --> 00:27:40.930 bacteria to concentrations of penicillin that 00:27:40.930 --> 00:27:43.410 were too low, or if the exposure time was too 00:27:43.410 --> 00:27:46.190 short, the bacteria wouldn't die. Instead, they 00:27:46.190 --> 00:27:49.029 would adapt. They developed the ability to survive 00:27:49.029 --> 00:27:51.599 future encounters with the drug. And this had 00:27:51.599 --> 00:27:54.400 been demonstrated in Esorius as early as 1942. 00:27:54.940 --> 00:27:58.240 Yes. This observation turned him into a prophet. 00:27:58.319 --> 00:28:00.859 He spent the rest of his life, especially after 00:28:00.859 --> 00:28:03.279 winning the Nobel Prize, campaigning for the 00:28:03.279 --> 00:28:05.920 responsible use of his discovery. He understood 00:28:05.920 --> 00:28:09.579 the stakes almost immediately. On June 26, 1945, 00:28:10.200 --> 00:28:12.480 just weeks after the end of the war in Europe, 00:28:12.740 --> 00:28:15.059 he delivered what is maybe the most crucial quote 00:28:15.059 --> 00:28:18.119 of his entire career. He warned that the thoughtless 00:28:18.119 --> 00:28:20.539 person playing with penicillin is morally responsible 00:28:20.539 --> 00:28:22.759 for the death of the man who finally succumbs 00:28:22.759 --> 00:28:25.000 to infection with the penicillin resistant organism 00:28:25.000 --> 00:28:28.180 i hope this evil can be averted just think about 00:28:28.180 --> 00:28:30.500 the weight of that statement Morally responsible. 00:28:30.759 --> 00:28:32.980 He's assigning this deep ethical culpability 00:28:32.980 --> 00:28:36.279 to misuse before the drug was even globally available. 00:28:36.559 --> 00:28:39.519 He saw the future perfectly. He was warning against 00:28:39.519 --> 00:28:42.319 exactly what happened in the 1950s and 60s when 00:28:42.319 --> 00:28:44.839 antibiotics became cheap and widely accessible. 00:28:45.119 --> 00:28:47.299 He elaborated on this in his Nobel lecture in 00:28:47.299 --> 00:28:49.960 December 1945, didn't he? He did. He predicted 00:28:49.960 --> 00:28:52.579 that the time may come when penicillin can be 00:28:52.579 --> 00:28:55.039 bought by anyone in the shops. Then there is 00:28:55.039 --> 00:28:57.660 the danger that the ignorant man may easily underdose 00:28:57.660 --> 00:29:01.099 himself. exposing his microbes to non -lethal 00:29:01.099 --> 00:29:03.960 quantities of the drug make them resistant. That 00:29:03.960 --> 00:29:06.680 is precisely what we call antimicrobial stewardship 00:29:06.680 --> 00:29:09.319 today. The careful management of antibiotics 00:29:09.319 --> 00:29:12.680 to prevent resistance. He articulated the concept 00:29:12.680 --> 00:29:15.059 of selective pressure and evolution in bacteria 00:29:15.710 --> 00:29:17.970 decades before it became a crisis. He was warning 00:29:17.970 --> 00:29:20.730 against using too little or stopping your treatment 00:29:20.730 --> 00:29:23.269 too soon or using it for a condition where it 00:29:23.269 --> 00:29:25.630 wasn't even necessary. And that warning is his 00:29:25.630 --> 00:29:28.329 lasting legacy. He didn't just give us the cure, 00:29:28.450 --> 00:29:30.430 he gave us the instruction manual for how not 00:29:30.430 --> 00:29:33.019 to lose it. And the fact that the first penicillin 00:29:33.019 --> 00:29:36.660 resistant strains of S. aureus emerged so soon 00:29:36.660 --> 00:29:40.339 after the drug's mass introduction, it just validates 00:29:40.339 --> 00:29:42.740 the devastating accuracy of his early observations. 00:29:43.079 --> 00:29:45.779 It underscores the foundational power of his 00:29:45.779 --> 00:29:48.440 critical thinking. He could anticipate the evolutionary 00:29:48.440 --> 00:29:51.180 response of the microbes themselves. The trajectory 00:29:51.180 --> 00:29:53.660 of Alexander Fleming's career is one defined 00:29:53.660 --> 00:29:56.960 not by simple luck. but by this extraordinary 00:29:56.960 --> 00:30:00.319 ability to observe anomalies and to fiercely 00:30:00.319 --> 00:30:03.099 question authority. He was a scientist who saw 00:30:03.099 --> 00:30:05.339 the failure of established practice in World 00:30:05.339 --> 00:30:09.099 War I, who discovered the world's first antimicrobial 00:30:09.099 --> 00:30:12.880 protein in his own tears. And finally, stumbled 00:30:12.880 --> 00:30:15.420 upon the mold that truly changed history. His 00:30:15.420 --> 00:30:18.440 legacy is immense. He was listed in Time magazine's 00:30:18.440 --> 00:30:20.700 100 Most Important People of the 20th Century. 00:30:20.880 --> 00:30:24.119 He transformed medicine, warfare, agriculture. 00:30:24.720 --> 00:30:26.980 And for a unique detail of that impact, you just 00:30:26.980 --> 00:30:28.619 have to look at the statue of him that stands 00:30:28.619 --> 00:30:31.299 outside the main bullring in Madrid, the Plaza 00:30:31.299 --> 00:30:33.819 de Todos de las Ventas. I love that detail. It 00:30:33.819 --> 00:30:36.599 was erected by grateful matadors because penicillin 00:30:36.599 --> 00:30:38.380 dramatically reduced the number of deaths from 00:30:38.380 --> 00:30:41.019 septic wounds that were a common fatal risk in 00:30:41.019 --> 00:30:43.299 the bullring. It's a testament to how his work 00:30:43.299 --> 00:30:46.220 permeated every corner of human life. He left 00:30:46.220 --> 00:30:48.779 us with a really complex narrative. a genius 00:30:48.779 --> 00:30:51.299 of observation, a scientist who preferred evidence 00:30:51.299 --> 00:30:53.519 over the establishment, and a reluctant public 00:30:53.519 --> 00:30:55.740 figure who had the humility to hand the chemical 00:30:55.740 --> 00:30:58.619 heavy lifting over to others. He truly ushered 00:30:58.619 --> 00:31:01.900 in the age of useful antibiotics. He did. But 00:31:01.900 --> 00:31:05.940 the true shadow he cast was his warning. Fleming 00:31:05.940 --> 00:31:08.500 was not only the discoverer, but the very first 00:31:08.500 --> 00:31:11.019 person to articulate the looming global threat 00:31:11.019 --> 00:31:13.720 of drug resistance. So if he made that observation 00:31:13.720 --> 00:31:16.220 and articulated that chilling quote about the 00:31:16.220 --> 00:31:18.500 thoughtless person being morally responsible 00:31:18.500 --> 00:31:21.039 just two months after the greatest conflict in 00:31:21.039 --> 00:31:23.480 human history ended, decades before we faced 00:31:23.480 --> 00:31:26.559 a true global superbug crisis. What does that 00:31:26.559 --> 00:31:28.619 tell us about the foundational necessity of critical 00:31:28.619 --> 00:31:30.819 observation in science and why that caution, 00:31:31.039 --> 00:31:33.900 given its immediacy and clarity, is more relevant 00:31:33.900 --> 00:31:36.519 now than ever before? It forces us to ask whether 00:31:36.519 --> 00:31:38.400 we have truly honored the instruction manual 00:31:38.400 --> 00:31:40.299 provided by the man who gave us the greatest 00:31:40.299 --> 00:31:41.279 victory over disease.