The Discovery of Penicillin
The mold that saved hundreds of millions of lives.
Scottish researcher Alexander Fleming accidentally left a petri dish of Staphylococcus bacteria uncovered while on vacation. Upon returning, he found that a stray mold spore (Penicillium) had grown and secreted a substance that actively killed the surrounding bacteria—the world's first true antibiotic.
Open in interactive timeline →Verified Facts
- Before penicillin, a simple scratch from a rose bush or a minor surgical infection was frequently a death sentence.
- It took over a decade for other scientists (Florey and Chain) to figure out how to purify and mass-produce the unstable drug in time for World War II.
- Fleming predicted the modern crisis of antibiotic resistance way back in his 1945 Nobel Prize speech, warning that using the drug incorrectly would make bacteria immune to it.
Frequently Asked Questions
What was The Discovery of Penicillin?
Scottish researcher Alexander Fleming accidentally left a petri dish of Staphylococcus bacteria uncovered while on vacation. Upon returning, he found that a stray mold spore (Penicillium) had grown and secreted a substance that actively killed the surrounding bacteria—the world's first true antibiotic.
When did The Discovery of Penicillin happen?
The Discovery of Penicillin: 1928 CE.
Why does The Discovery of Penicillin matter?
The mold that saved hundreds of millions of lives.
Sources & Further Reading
Cite This Page
AskHistoryAI. “The Discovery of Penicillin.” AskHistoryAI — Interactive Timeline of Everything. Updated 2026-09-11. https://askhistoryai.com/event/inv-penicillin/
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