“…519 extensive than those induced by Col SK virus and the muscle tissue contained no free virus. Poliomyelitis virus produces no significant local lesions in intramuscularly injected rodents, i. e. mice or hamsters (GAEDEKE et al 1955). Yet, the viruswill set up a severe myositic process when the animals receive cortisone, as was clearly shown by SHWARTZMAN (1954).…”