resolved · Earned
Exposure to insufficient penicillin doses could select resistant microbes and make later treatment fail.
Source-backed summary; not presented as a verbatim quotation.
Alexander Fleming
Bacteriologist and Nobel laureate · United Kingdom
The world at the time.
Penicillin had transformed treatment of bacterial infection during the war. Fleming’s Nobel lecture warned that the drug’s success depended on how it was used.
What happened.
Mary Barber published clinical infections caused by penicillin-resistant staphylococci in 1947. Resistance became a durable clinical problem rather than a hypothetical objection to the new treatment.
Predicted vs actual.
| Metric | Predicted | Actual | Variance / caveat |
|---|---|---|---|
| Penicillin resistance in clinical infections | Can emerge under selective exposure | Reported clinically by 1947 | Conditional risk realized |
The counter-signal.
Fleming’s 1929 experiments showed strong antibacterial activity against susceptible bacteria. That striking efficacy encouraged confidence, but short laboratory assays could not establish durable susceptibility under widespread use.
Verdict.
Reasoning: sound · Outcome: right
The resistance mechanism was sound and subsequent clinical evidence confirmed the warning. The record is a conditional risk forecast, not an invented prediction that every infection would become untreatable by a particular year.
Cause of death / explanatory lens.
No cause of death assigned
The lesson.
Does short-term efficacy tell us how a biological adversary will adapt?
Sources.
- Penicillin: Nobel Lectureprimary · 1945-12-11 · claim
- Staphylococcal infection due to penicillin-resistant strainsprimary · 1947-11-29 · outcome
- On the Antibacterial Action of Cultures of a Penicilliumprimary · 1929 · counter_signal
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