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Experimental & Applied Acarology

, Volume 19, Issue 1, pp 19–29 | Cite as

Differences in Borrelia infections in adult Ixodes persulcatus and Ixodes ricinus ticks (Acari: Ixodidae) in populations of north-western Russia

  • Yurii V. Kovalevskii
  • Edward I. Korenberg
Article

Abstract

Dark-field microscopy was used to determine the number of Borrelia spirochetes in 630 standard preparations obtained from adult ixodid ticks (344 Ixodes persulcatus and 286 I. ricinus) collected in 1989-92 in the Leningrad region of Russia. The average numbers of Borrelia in I. persulcatus and I. ricinus preparations were 34.7 and 23.3 per 100 microscopic fields, respectively. The maximal individual values registered each year for ticks of both species were several hundred times greater than the minimal values. Ticks carrying relatively small numbers of Borrelia generally predominated. Proportions of more heavily infected ticks varied considerably from year to year. These parameters were significantly higher in foci with predominance of I. persulcatus ticks. As a consequence, risk to acquire Lyme borreliosis in such foci is considered greater than in foci where I. ricinus predominates.

Key words

ticks Ixodes persulcatus Ixodes ricinus Borrelia spirochetes dark-field microscopy Russia 

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Copyright information

© Chapman & Hall 1995

Authors and Affiliations

  • Yurii V. Kovalevskii
    • 1
  • Edward I. Korenberg
    • 1
  1. 1.Laboratory of Vectors of Infections, Gamaleya Institute of Epidemiology and MicrobiologyRussian Academy of Medical Sciences, Center on Borrelioses for RussiaMoscowRussia

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