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Fleming experimented further and named the active substance penicillin. It was two other scientists however, Australian Howard Florey and Ernst Chain, a refugee from Nazi Germany, who developed penicillin further so that it could be produced as a drug.
Penicillin was mass produced in 1942-1945 and not before because it was only in the early stages of testing however many soldiers were dying because of infection during the war meaning as it prevented infection it was needed in mass.
The drug was a big step forward in medicine, but some people started to become immune to it.
Fleming died on 11 March 1955.
Today we still use penicillin.
BY KIM BENNY
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