What did Alexander Fleming start doing when he moved to London?

When Alexander Fleming moved to London, he began working at St. Mary's Hospital Medical School as a researcher and lecturer. There, he conducted important studies on bacteriology and began his groundbreaking work on antibiotics, ultimately leading to the discovery of penicillin in 1928. His research focused on the properties of bacteria and the potential use of substances to combat infections. This work would later revolutionize medicine and save countless lives.