Clinical aspects of non-paralytic poliomyelitis and a clinical comparison of poliomyelitis epidemics due to type I and type II virus.
D058872:Epidemics; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology*; D017955:Poliovirus
POLIOMYELITIS VIRUS; POLIOMYELITIS/epidemiology