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His work resulted in compounds which he used to treat patients at least one year before the commonly accepted discovery of penicillin by Alexander Fleming.
Although, the discovery of penicillin has been attributed to Alexander Fleming, Picados' old laboratory notebooks from 1923 show records of the antibiosis of penicillium sp.
The classical example of an antibiotic discovered as a defense mechanism against another microbe is the discovery of penicillin in bacterial cultures contaminated by Penicillium fungi in 1928.
The notion of serendipity is a common occurrence throughout the history of scientific innovation such as Alexander Fleming's accidental discovery of Penicillin in 1928, and the invention of the microwave oven by Percy Spencer in 1945, to name but a few.