Royal Society of Biology logo Sir Alexander Fleming Heritage Lottery Fund logo Biotechnology and Biological Sciences Research Council logo

header image
Plaque text
Sir Alexander Fleming 1881 - 1955 Discovered penicillin in the second storey room above this plaque
St Mary's Hospital, Praed Street, W2 1PG, London
Photograph by G Baker
Photograph by G Baker

This plaque marks where penicillin was discovered.