🦠Alexander Fleming
Original nameAlexander Fleming
British Bacteriologist, Discoverer of Penicillin
The Laws Behind the Technology · Theoretical Founders
The Discovery of PenicillinThe Opening of the Antibiotic EraThe Nobel Prize in Physiology or Medicine (1945)
Who they are
Alexander Fleming (1881–1955) was a British bacteriologist who in 1928, returning to his lab after a vacation, chanced to notice that in a staphylococcus culture dish not properly cleaned and accidentally contaminated by Penicillium mold, the staphylococci around the mold colony were markedly inhibited and could not grow and multiply normally, from which he inferred the mold must secrete some active substance able to kill bacteria, and named this substance "penicillin." Yet Fleming himself failed to solve the chemical and engineering problem of large-scale purification and stable production of penicillin from the mold culture, and this research was shelved for years, until more than a decade later the Oxford team led by Howard Florey and Ernst Chain successfully cracked the scaled purification and production process, coinciding with the outbreak of World War II, and penicillin was swiftly put into the battlefield to treat many infected wounded, saving countless soldiers and civilians who would otherwise have died of bacterial infection. The successful application of penicillin formally opened the "antibiotic era" in human history, and the successive appearance of various antibiotics thereafter gave, for the first time, effective treatment for many bacterial infectious diseases that had long threatened human life; Fleming, Florey, and Chain jointly won the 1945 Nobel Prize in Physiology or Medicine.
Primary sourcesAlexander Fleming, "On the Antibacterial Action of Cultures of a Penicillium" (1929 paper)The 1945 Nobel Prize in Physiology or Medicine citation
Key stories
An Uncleaned Culture Dish
When Fleming returned from vacation to tidy a batch of bacterial culture dishes he had casually left, he chanced to find one dish accidentally contaminated by Penicillium spores drifting in from the air, and, more astonishingly, that around the mold colony the densely growing staphylococci had a marked zone of inhibition and recession — this "failed experiment" an ordinary person might have discarded, precisely because of Fleming’s keen observation and curiosity, at last became the starting point of penicillin, a great discovery that changed the course of human medical history.
A Discovery That Only Truly Saved Lives Over a Decade Later
After Fleming discovered penicillin’s antibacterial phenomenon, he himself for nearly a decade failed to crack the complex chemical-engineering problem of stably purifying penicillin in quantity from the mold culture, and this research was for a time shelved and forgotten by the field, until the Oxford team led by Howard Florey and Ernst Chain took up the research and successfully solved the scaled production process, coinciding with the height of World War II, and penicillin was swiftly put into field hospitals to treat many wounded — the long, arduous engineering journey often lying between "laboratory discovery" and "truly benefiting patients" is one of the most profound lessons Fleming’s penicillin story left to the later history of technology.
Echoes today
Below are how modern works borrow or reinterpret this name or story — not the original material. The two differ, so keep them apart.
The contemporary warning of antibiotic resistanceIn his 1945 Nobel lecture Fleming himself already warned that misuse of penicillin might make bacteria resistant, a prescient warning repeatedly cited in contemporary public-health discussion of antibiotic misuse and the spread of resistant bacteria.