[Studies on poliomyelitis epidemic in Hokkaido in 1960. I. Clinical studies].
D002675:Child, Preschool; D004812:Epidemiologic Methods; D004813:Epidemiology; D006801:Humans; D007223:Infant; D007564:Japan; D011051:Poliomyelitis / Q000175:diagnosis* / Q000453:epidemiology*