Linked from
The 53 pages that link to Penicillin, each with the reason it gives.
FungusRelated: Fungal compounds launched a major class of medicines against bacterial infections.
FungiRelated: A fungal product transformed the treatment of bacterial infections.
SyphilisRelated: Penicillin is the standard treatment for syphilis, including during pregnancy.
ErysipelasRelated: It is a standard treatment when erysipelas is caused by susceptible streptococci.