Abstract
Blood samples were taken from 541 small mammal captured in 2013–2015 in Znamensky district of Omsk region from
 Ixodes persulcatus and Ixodes trianguliceps sympatric area and examined for the Babesia spp. presence by nested PCR
 with subsequent sequencing of positive samples. Babesia microti DNA was found in 31,1 % of positive samples; a proportion
 of infected mammals varied from 5,3 % to 61,6 % in different sampling periods. B. microti DNA was found in
 samples from three prevailing Myodes species as well as from a root vole (Microtus oeconomus), field voles (Microtus
 argestis) and Siberian chipmunks (Tamias sibiricus). It was shown that identified B. microti samples belong to two
 genetic groups: B. microti ‘US’-type and B. microti ‘Munich’-type; notably that > 90 % infected mammals contained
 DNA of nonpathogenic for human B. microti ‘Munich’-type. We suppose that I. trianguliceps tick is the most probable
 vector of B. microti ‘Munich’-type.
Highlights
На наличие бабезий были исследованы образцы крови от 541 грызуна, отловленных в 2013–2015 годах в Омской области в зоне симпатрии клещей Ixodes persulcatus и Ixodes trianguliceps
Blood samples were taken from 541 small mammal captured in 2013–2015 in Znamensky district of Omsk region from Ixodes persulcatus and Ixodes trianguliceps sympatric area and examined for the Babesia spp. presence by nested PCR with subsequent sequencing of positive samples
Babesia microti DNA was found in 31,1 % of positive samples; a proportion of infected mammals varied from 5,3 % to 61,6 % in different sampling periods
Summary
На наличие бабезий были исследованы образцы крови от 541 грызуна, отловленных в 2013–2015 годах в Омской области в зоне симпатрии клещей Ixodes persulcatus и Ixodes trianguliceps. ДНК Babesia microti была обнаружена в 31,3 % образцов (5,3–61,6 % в разные периоды отлова). Выявленные образцы B. microti относились к двум генетическим группам – B. microti ‘US’-type и B. microti ‘Munich’-type; при этом непатогенные B. microti ‘Munich’-type были обнаружены более чем у 90 % инфицированных особей. Наиболее вероятным переносчиком B. microti ‘Munich’-type являются клещи I. trianguliceps. Ключевые слова: Babesia microti, Ixodes persulcatus, Ixodes trianguliceps, лесные полевки, генетические варианты
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