1928 (antibacterial observation) / Europe
Penicillin begins with an observation, not a ready-made drug
Fleming observed bacteria failing to grow near a mold colony. Turning penicillin into a usable, widely produced medicine required later collaborative breakthroughs.
The story
At St Mary’s Hospital in London, Fleming noticed an inhibition zone around mold and published the finding in 1929. The 1928 date therefore marks observation, not widespread clinical treatment. Florey, Chain, Heatley and colleagues developed purification and testing; British and American institutions and companies helped make large-scale production possible during the 1940s.
Connections and context
An unusual laboratory observation needed isolation, testing, clinical investigation and production engineering before becoming a treatment. Discovery and usable technology involved different stages and many contributors.
Dates and precision
1928 (antibacterial observation) Documented date
Positioned by the documented year, month or day. Missing precision is not inferred.
Representative map location
St Mary’s Hospital, London
The marker represents the 1928 observation; Oxford research and transatlantic production took place elsewhere.
Representative coordinates · 51.517°, -0.174°
A marker identifies one representative place, such as a manuscript collection, laboratory or observing site. It does not mean the work happened only there, or assign a shared discovery to one country.
Bibliography
- American Chemical Society: Discovery and Development of Penicillin
- The Discovery of Penicillin, Dunn School, University of Oxford
- The Discovery of Penicillin: CDC historical study
References are listed as plain bibliography titles. They support particular facts or context; a reference does not certify every interpretation in a story.