[Study of the distribution of epidemic nephritis in the Vracha District].
D002031:Bulgaria; D004196:Disease Outbreaks; D006482:Hemorrhagic Fevers, Viral / Q000150:complications / Q000453:epidemiology*; D006801:Humans; D009393:Nephritis / Q000150:complications / Q000453:epidemiology*
Prouchvane razprostranenieto na endemichniia nefrit vuv Vrachanski okrug