Abstract
Epizootiological monitoring of the forest-steppe area of the natural tularemia focus in the Stavropol region has revealed that the role of particular species of small mammals in the persistence of natural tularemia focality is unequal. Epizootic activity of the focus in 1959-1970 was determined by the numerous species of rodents: Microtus arvalis , mice of Syvaemus genus and Mus musculus . In 1972-2010 there occurred significant changes in the grouping of the main tularemia agent carriers under the influence of strong anthropogenic pressure. Nowadays the leading role is played by the widely-spread and subsistent mice of Sylvaemus genus and C. suaveolens , the latter ones being responsible for 31.2 % of overall, isolated from small mammals, tularemia agent strains. In addition to this, epizootic significance of M. arvalis has greatly changed. Index of strains isolated from field vole has lowered from 55.3 up to 28.4. Numbers of M. arvalis and Mus musculus are continuously on the low level, which is due to the absence of favorable breeding conditions. It reduces their impact on the persistence of natural focality in the territory under surveillance significantly.
Highlights
Epizootiological monitoring of the forest-steppe area of the natural tularemia focus in the Stavropol region has revealed that the role of particular species of small mammals in the persistence of natural tularemia focality is unequal
Nowadays the leading role is played by the widely-spread and subsistent mice of Sylvaemus genus and C. suaveolens, the latter ones being responsible for 31.2 % of overall, isolated from small mammals, tularemia agent strains
Numbers of M. arvalis and Mus musculus are continuously on the low level, which is due to the absence of favorable breeding conditions
Summary
Материалом для настоящего сообщения послужили результаты эпизоотологического обследования на туляремию лесостепной части территории Ставропольского края в период с 1972 по 2010 год. Лабораторному бактериологическому исследованию на туляремию подвергнуты 11130 особей мелких млекопитающих различных видов, в том числе: Sorex araneus – 48 экз., Crocidura suaveolens – 525, Sicista subtilis – 1, Sicista betulina – 4, Cricetulus migratorius – 478, Mesocricetus raddei – 3, Microtus arvalis – 1704, мыши рода Sylvaemus На территории лесостепной части природного очага было выделено 252 штамма возбудителя туляремии, в том числе от грызунов и насекомоядных – 183 (72,6 %), эктопаразитов – 68 (27,0 %), из объектов внешней среды – 1 (0,4 %). ЭПИДЕМИОЛОГИЯ, БИОБЕЗОПАСНОСТЬ риях Ставропольского противочумного института бактериологическими и серологическими методами
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