[On the periodicity of the occurrence of epidemic hepatitis].
D004405:Dysentery, Bacillary / Q000453:epidemiology; D006506:Hepatitis A / Q000453:epidemiology*; D006801:Humans; D010507:Periodicity; D012426:Russia; D012541:Scarlet Fever / Q000453:epidemiology
O periodichnosti zabolevaemosti épidemicheskim gepatitom.