How comes Fleming and his Penicillin are viewed as the beginning of the antibiotic era when Prontosil was already in use years before Penicillin? | AskHistorians Archive Observer

How comes Fleming and his Penicillin are viewed as the beginning of the antibiotic era when Prontosil was already in use years before Penicillin?

by ponylover666

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Penicillin was discovered in 1928, Prontosil in 1932.