Further to the letter from Mr K.A.Lees(Pf,7 June,p793) I write to confirm that penicillin was indeed discovered by Alexander Fleming at St Mary's Hospital in September 1928.However,there are other matters on which I must correct him Fleming was not working on his earlier discovery lysozyme at the time but was studying staphylococcal variation when one of his culture plates became contaminated by the fungus penicillium motatum.
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