[Directions and results of epidemiologic surveillance of nature foci of infection in the North-West].
D000818:Animals; D006801:Humans; D012426:Russia; D015047:Zoonoses / Q000453:epidemiology*
Napravleniia i rezul'taty épidemiologicheskoĭ razvedki prirodnoochagovykh infektsiĭ na Severo-Zapade