Medicine and public health · GCSE History
Penicillin
GCSE History penicillin: Fleming’s 1928 observation, Florey and Chain’s 1940s development, and wartime US–British production that turned a mould into a usable antibiotic.
Chance found it; science purified it; war manufactured it.
The important bits
What you need to know
- 1
Paul Ehrlich’s Salvarsan (compound 606, 1909) and later sulphonamides (Prontosil, Gerhard Domagk, 1930s) were chemical “magic bullets” against specific microbes — the idea that drugs could hunt germs.
- 2
Alexander Fleming, at St Mary’s Hospital, London, noticed in 1928 that a Penicillium mould killed staphylococci on a contaminated Petri dish. He published in 1929 but could not purify or mass-produce the juice.
- 3
Howard Florey, Ernst Chain and Norman Heatley at Oxford (from 1938–40) purified penicillin, tested it on mice (1940) and then on Albert Alexander (1941), who improved then relapsed when the supply ran out.
- 4
Wartime need in 1941–45 took production to US pharmaceutical firms (deep-fermentation in corn-steep liquor). The US and British governments funded scale-up. D-Day troops carried penicillin.
- 5
Fleming, Florey and Chain shared the 1945 Nobel Prize. Popular memory prefers Fleming’s chance; exam memory must include the Oxford team and American industry.
- 6
Consequence: bacterial infections (wound sepsis, pneumonia, gonorrhoea) became treatable in a way carbolic and sulphonamides could not match. Surgery and battlefield medicine changed again.
- 7
Limits: viruses are unaffected; resistance evolves (already noted by Fleming); access depended on production and, in Britain, later on the 1948 NHS. Penicillin is not the end of the medicine story.
- 8
Factors bundle: chance (mould), individual (Fleming), science/teamwork (Oxford), war and government (funding, factories), technology (fermentation). A list without a judgement is not an essay.
Quotations worth analysing
Short evidence. Real method.
“One sometimes finds what one is not looking for.”
Chance is real, but only a bacteriologist already thinking about inhibition would notice and publish. Prepared mind, not lucky dustman.
“It saved the wounded who would have died of sepsis in 1918.”
Consequence needs a comparison point. The First World War had Carrel-Dakin wound irrigation; the Second had an antibiotic. That is change under fire.
“The mould is not the medicine until it is made in tanks.”
Stops the myth that 1928 equalled 1944. Development and manufacture are historical events, not footnotes.
Go deeper
Why 1928 was not 1944
Fleming’s plate is a superb hook and a dangerous stopping point. Penicillin is unstable; 1920s laboratory kit could not isolate enough to treat a person. Florey’s team used freeze-drying, solvent extraction and a bath of bedpans and biscuit tins to grow mould — then proved it in mice. Albert Alexander’s 1941 case is the human hinge: the drug worked until it ran out, so the problem was quantity. In 1941 Florey and Heatley flew to the United States because Britain was bombed and short of industrial capacity. Peoria’s fermentation science and firms such as Pfizer turned a university curiosity into vials. When you write “war”, specify: government contracts, draft-age soldiers as a market, and transatlantic alliance. Chance started the file; war closed it.
Go deeper
Magic bullets before and after
Place penicillin in a sequence or it looks like a miracle. Ehrlich’s Salvarsan treated syphilis with an arsenic compound — toxic but targeted. Sulphonamides in the 1930s (Domagk) cut some bacterial deaths and even saved Churchill in 1943 from pneumonia in some accounts of Prontosil-related drugs. Penicillin was broader and, at first, astonishingly safe. After 1945, streptomycin (1944, Waksman/Schatz) attacked TB, extending germ-theory treatment into Koch’s old enemy. The NHS then distributed antibiotics as a right. The new limit is resistance and overuse. A sophisticated conclusion: germ theory made hunting microbes thinkable; chemistry and biology supplied weapons; the state put them in GP bags. Fleming is a chapter, not the book.
See the idea in action
Question: “Chance was the main factor in the development of penicillin.” How far? Judgement: chance started the story in 1928, but science, teamwork, government and war turned a mould into a medicine. Support: Fleming’s contaminated plate. Challenge: Florey and Chain’s purification, 1940 mouse tests, US fermentation, wartime funding. Without those, the chance event stays a paper in 1929. Conclusion: chance was necessary but not sufficient; war was the accelerator that mattered most for patients.
Exam technique
Turn knowledge into marks
Name Fleming 1928, Florey and Chain, Albert Alexander 1941, and wartime US production. If you only have Fleming, you are telling a myth, not GCSE History.
Common mistakes
Do not give these marks away
- 01
Writing as if penicillin was used on patients in 1928.
- 02
Forgetting Florey, Chain, Heatley and American factories.
- 03
Claiming penicillin cured viruses or TB (streptomycin is the TB headline).
What turned Fleming’s 1928 observation into a usable drug?
AThe 1875 Public Health Act ordered mould to be grown in every hospital
BFlorey and Chain’s Oxford purification plus Second World War mass production in the United States
CJenner’s 1796 cowpox experiment
DKoch’s staining of the TB bacillus in 1882
Show the answer
Florey and Chain’s Oxford purification plus Second World War mass production in the United States. Observation ≠ medicine. The Oxford team and wartime industry are the development story examiners want.
Quick questions
If this is the bit you searched
Did Fleming do nothing after 1928?
He published and kept samples, but he moved on and lacked the biochemical team to purify penicillin. Credit him for noticing; do not invent a 1930s Fleming factory.
Why did Britain need American production?
In 1941 British industry was stretched by bombing and war production. US firms had deep-tank fermentation capacity and government money. Alliance is part of the medicine story.
How does penicillin show germ theory at work?
It is a biological agent killing bacteria — only rational if bacteria cause the disease. Humoural doctors would not have been hunting a mould juice for staphylococci.
What is antibiotic resistance doing in a GCSE answer?
As a limitation and a modern continuity of the germ-treatment arms race. Fleming himself warned that under-dosing would train microbes. It is a judgement, not a science lecture.