3 sept. 1928 - Penicillin is discovered

Description:

Fleming discovered that mold on one of his dishes had a ring of inhibited bacterial growth. The mold was able to kill a wide range of bacteria and once purified it was used as an antibiotic. The production and research was shifted to the US from the UK due to WWII.

https://www.acs.org/content/acs/en/education/whatischemistry/landmarks/flemingpenicillin.html