Waksman da ma'aikatan dakin gwaje-gwajensa sun gano magungunan rigakafi da yawa, gami da actinomycin, clavacin, streptothricin, streptomycin, grisein, neomycin, fradicin, candicidin, da candidin. Daga cikin waɗannan, streptomycin da neomycin sun sami aikace-aikace mai yawa a cikin maganin cututtukan cututtuka da yawa. Streptomycin shine maganin rigakafi na farko don cutar tarin fuka (TB).
1943 shekara