<P> Penicillin was discovered in 1928 by Scottish scientist Alexander Fleming . People began using it to treat infections in 1942 . There are several enhanced penicillin families which are effective against additional bacteria ; these include the antistaphylococcal penicillins , aminopenicillins and the antipseudomonal penicillins . They are derived from Penicillium fungi . </P>
when was penicillin first introduced to the public
1942