[Morphology of a natural focus of Pomona leptospirosis in a steppe area].

The natural focus of Leptospira pomona infection has been found to include areas of the forest-meadow flood plain where the circulation of leptospires is constantly maintained among small mammals (the nucleus of the focus). A high level of Leptospira carriership (17.7%) among the animals has been registered in the central part of the flood plain and near the terraces, these areas having the most favorable conditions for the development of epizootic leptospirosis.