Streptococcus pyogenes
Florey's team at Oxford showed that "Penicillium" extract killed different bacteria ("Streptococcus pyogenes, Staphylococcus aureus," and "Clostridium septique") in culture and effectively cured "Streptococcus" infection in mice. They reported in the 24 August 1940 issue of "The Lancet" as "Penicillin as a chemotherapeutic agent" with a conclusion: