Alexander Fleming — "The future of chemotherapy lies in the intelligent use of these new antibacteria…"
The future of chemotherapy lies in the intelligent use of these new antibacterial agents.
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More from Alexander Fleming
"The mould grew, and then I saw the clear space around it."
"The therapeutic value of penicillin is enormous, but its indiscriminate use could lead to disaster."
"The public will not understand the dangers of using penicillin indiscriminately."
"A good gulp of hot whisky at bedtime—it's not very scientific, but it helps."
"It is not the discovery of a new substance that is important, but the recognition of its properties."
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Understanding this quote
What it means
Antibacterial drugs — then a new category — would only fulfill their promise if physicians and scientists used them judiciously, not indiscriminately. 'Chemotherapy' here means chemical treatment of disease broadly, not cancer care. The warning: new drugs create the illusion of unlimited power, but reckless application accelerates bacterial resistance and wastes a finite resource. Real progress requires matching the right drug, dose, and duration to each infection with precision and restraint.
Relevance to Alexander Fleming
Fleming discovered penicillin in 1928 when a mold contaminant killed bacteria on an abandoned petri dish. Throughout his career he stressed that the drug's value was fragile — misuse would breed resistance. His 1945 Nobel Prize lecture explicitly warned that patients taking insufficient doses could cause bacterial mutation. This quote distills his core conviction: scientific discovery is only the first step; responsible stewardship of that discovery is the harder, more consequential work.
The era
By the 1940s penicillin had been mass-produced for WWII, saving soldiers from infections that killed millions in WWI. The public treated antibiotics as miracle cures and demanded them freely. Yet resistant staphylococcus strains were already appearing in British hospitals by 1946. Fleming watched a culture of uncritical enthusiasm take hold just as bacterial evolution began catching up. His insistence on discipline was a minority voice against an era of near-religious faith in pharmaceutical progress.
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