title: [Features of the parasitic system of Ixodid ticks--Borrelia--small mammals in the Russian Northwest].
abstract: Mammals and ticks was collected in 1995-1997 years in Novgorod region from May to September. Traps were exposed during 5 consecutive days every month in 4 different biotopes. 928 hosts were captured during three years. 357 larvae and 59 nymphs of Ixodes persulcatus, 356 larvae and 71 nymphs of I. trianguliceps were collected. The Clethrionomys glareolus and Sorex araneus are main hosts of larvae of I. persulcatus and I. trianguliceps. C. glareolus feed 76.2% of I. persulcatus larvae and 25% of I. trianguliceps larvae, S. araneus--27.1 and 45.9% of larvae, respectively. The abundance of larvae and nymphs of I. persulcatus was 0.26 and 0.13 on C. glareolus, and 0.41, 0.08 on S. araneus; for I. trianguliceps this indices are 0.15 and 0.09, 0.95 and 0.13, respectively. Infection rate of larvae and nymphs I. persulcatus and I. trianguliceps with Borrelia burgdorferi s. l. was 94-100%, confirmed by IFA with H5332. The borreliemia was found in 13.6% G. glareolus, 6.6--Microtus arvialis, 4.2% Apodemus uralensis. For all species of sorex this index varied from 0.9 to 44.9% in different years. Increase of mammal's numbers with the borreliemia correlated with peaks of activity of larvae of I. persulcatus. Finding of Borrelia burgdorferi s. l. in I. trianguliceps indicates an occurrence of enzootic locuses.
authors.forename: L A
authors.initials: LA
authors.lastname: Grigor'eva
authors.forename: K A
authors.initials: KA
authors.lastname: Tret'kiakov
mesh_terms: D000818:Animals; D003411:Arvicolinae; D015748:Borrelia burgdorferi Group / Q000502:physiology*; D018884:Ixodes / Q000382:microbiology*; D009115:Muridae; D012426:Russia; D012788:Shrews
vernacular_title: Osobennosti parazitarnoĭ sistemy iksodovye kleshchi--Borrelii--melkie mlekopitaiushchie na Severo-Zapada Rossii.