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Between-year variation and spatial dynamics of Cryptosporidium spp. and Giardia spp. infections in naturally infected rodent populations

Published online by Cambridge University Press:  10 November 2008

A. BAJER
A. BAJER*
Affiliation:
Department of Parasitology, Institute of Zoology, University of Warsaw, Miecznikowa 1, 02-096Warsaw, Poland
*
*Corresponding author. Tel: +48 22 55 41 117. Fax: +48 22 55 41 203. E-mail: anabena@biol.uw.edu.pl
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Summary

Prevalence and abundance of Cryptosporidium spp. and Giardia spp. infections were studied over the 8-year period in 3 species of rodents in N.E. Poland (bank vole Myodes glareolus-1523; yellow-necked mouse Apodemus flavicollis- 638; common vole Microtus arvalis- 419). Prevalence was 53·8, 28·1 and 62·3% respectively for Cryptosporidium spp. and 58·3, 24·4 and 74·2% respectively for Giardia spp. Prevalence and abundance of infection varied markedly across 8 years of the study with 1998 and 2002 being years of higher prevalence and abundance, following changes in the densities of host species. The distribution of intestinal protozoa in forest rodents did not vary in the 3 isolated sites during the 4-year study. In the case of Cryptosporidium, fewer older animals carried infection and infections of the oldest bank and common voles were relatively milder. In the case of Giardia in yellow-necked mice, infections were more common in older age classes (2 and 3). The two species showed significant co-occurrence and in animals carrying both species there was a strong significant positive correlation between abundance of infection with each. These data are discussed in relation to the parasite genotypes identified in this region and in respect of the role of various ecological factors in shaping of intestinal protozoa communities.

Keywords

bank voleMyodes glareolusyellow-necked mouseApodemus flavicolliscommon voleMicrotus arvalisCryptosporidiumGiardiareservoirecologyco-occurrenceco-infections

Information

Type
Research Article
Information
Parasitology , Volume 135 , Issue 14 , December 2008 , pp. 1629 - 1649
Copyright
Copyright © 2008 Cambridge University Press

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