Prontosil

Prontosil was effective against streptococcus infections and led to the development of many antibacterial drugs. Domagk tested his discovery on his own young daughter, who had been infected following a needle prick. When other treatments failed, he injected a large quantities of Prontosil and she recovered. This represented a significant advance in chemotherapy.
 Gerhard Domagk Germany 1932 Prontosil

Prontosil was effective against streptococcus infections and led to the development of many antibacterial drugs. Domagk tested his discovery on his own young daughter, who had been infected following a needle prick. When other treatments failed, he injected a large quantities of Prontosil and she recovered. This represented a significant advance in chemotherapy.