Alexander Fleming — "My only merit is that I did not discard the cultures at an early stage."
My only merit is that I did not discard the cultures at an early stage.
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More from Alexander Fleming
"It is not difficult to make microbes resistant to penicillin in the laboratory by exposing them to concentrations not sufficient to kill them, and the same thing has occasionally happened in the body."
"I was not looking for penicillin when I discovered it. I was looking for a better antiseptic."
"The thought that I might have discovered something which would be of value in treating disease was, of course, uppermost in my mind."
"The discovery of penicillin was a stroke of luck, but it was also the result of many years of hard work."
"My work was not a flash of genius, but a gradual unfolding of facts."
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Understanding this quote
What it means
Fleming is not claiming brilliance — he is crediting patience. The quote says his achievement came from resisting the impulse to discard a seemingly ruined experiment. When a mold contaminated his bacterial cultures, he paused instead of throwing them away. The lesson: great discoveries often hide inside apparent failures. What separates a discoverer from everyone else is sometimes just the refusal to give up on something that looks wrong.
Relevance to Alexander Fleming
In 1928, Fleming returned from vacation to find a mold had contaminated a petri dish growing Staphylococcus bacteria. Where the mold grew, bacteria had died. Most researchers would have discarded the plate as spoiled — he investigated instead. Known for his careful eye and self-deprecating manner, Fleming spent his career downplaying his role in penicillin's development, often crediting Florey and Chain. This quote is characteristically Fleming: deflecting genius while accidentally revealing it.
The era
Fleming worked during an era when bacterial infections — pneumonia, sepsis, scarlet fever — killed millions with no effective treatment. World War I had demonstrated how infected wounds killed more soldiers than combat. The 1920s medical world was desperately seeking antibiotics. Fleming's 1928 discovery, and penicillin's mass production by the 1940s, transformed medicine entirely. His restraint in not discarding those cultures arguably saved more lives than any single moment in medical history.
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