[Leptospira infection under the natural conditions of the environs of Saint Petersburg].

The existence of valent natural foci of leptospirosis, stable and polyhostal, under the conditions of urban agglomerations has been established. In an intensively urbanized landscape, the foci of mixed (natural and anthropic) type can be found. Depending on the character of microlandscape in a given zone, the main hosts of leptospires are different species of small mammals in whose populations, as a rule, the circulation of at least three Leptospira species is observed.

[Endemic foci of hemorrhagic fever with renal syndrome in the North-Western region of the European part of the USSR].

For the detection of specific antigens of hemorrhagic fever with renal syndrome (HFRS) virus, examinations were carried out covering 8.061 animals of 23 species trapped in the Murmansk, Archangelsk, Vologda, Novgorod, Pskov, Leningrad regions, the Komi ASSR, Estonian SSR, Latvian SSR, and Lithuanian SSR in 1984-1987. Different activity and variable species-specific composition of animal virus carriers in the north, south, and west of the north-western region were demonstrated.

[Tularemia on the Kola Peninsula].

In 1982 Francisella tularensis was isolated for the first time on the Kola Peninsula from rodents caught in the environs of Kirovsk and Nickel. This fact confirmed the suggestion concerning the existence of the natural foci of tularemia on the Kola Peninsula.