[Present questions on epidemiology of poliomyelitis.  I.  Epidemiologic classification and mechanism of transmission of infection].
D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology*
POLIOMYELITIS/epidemiology
Aktual'nye voprosy epidemiologii poliomielita.  I.  Epidemiologicheskaia klassifikatsiia i mekhanizm peredachi infektsii.