The Oxford team’s 1940 paper “Penicillin as a Chemotherapeutic Agent” was published in The Lancet.
The paper appeared in the 24 August 1940 issue and reported the Oxford group’s progress in cultivating, extracting and testing penicillin. The team, led by Howard Florey and including Ernst Chain and Norman Heatley, showed that the substance could kill bacteria in laboratory tests and protect infected animals.
This publication is sometimes confused with later penicillin papers in Nature or The Lancet. The Oxford article was the key 1940 report; later work described further purification, clinical trials and the drug’s expanding medical use. The paper initially attracted little public attention, despite its importance.
Alexander Fleming had identified penicillin’s antibacterial effect in 1928, but the Oxford group transformed that observation into a potentially usable treatment. Fleming, Florey and Chain later shared the 1945 Nobel Prize in Physiology or Medicine for the discovery and development of penicillin.