Bajer A
Department of Parasitology, Institute of Zoology, University of Warsaw, Miecznikowa 1, 02-096 Warsaw, Poland.
Parasitology. 2008 Dec;135(14):1629-49. doi: 10.1017/S0031182008004952. Epub 2008 Nov 10.
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.
在波兰东北部对3种啮齿动物（小林姬鼠Myodes glareolus - 1523只；黄颈姬鼠Apodemus flavicollis - 638只；普通田鼠Microtus arvalis - 419只）进行了为期8年的隐孢子虫属和贾第虫属感染率及感染丰度的研究。隐孢子虫属的感染率分别为53.8%、28.1%和62.3%，贾第虫属的感染率分别为58.3%、24.4%和74.2%。在研究的8年中，感染率和感染丰度随宿主物种密度的变化而显著不同，1998年和2002年是感染率和感染丰度较高的年份。在为期4年的研究中，3个隔离地点森林啮齿动物肠道原生动物的分布没有变化。就隐孢子虫而言，年龄较大的动物感染较少，最年长的小林姬鼠和普通田鼠的感染相对较轻。就黄颈姬鼠中的贾第虫而言，感染在年龄较大的类别（2龄和3龄）中更为常见。这两个物种显示出显著的共现，在同时携带这两个物种的动物中，每种感染的丰度之间存在强烈的显著正相关。结合该地区鉴定出的寄生虫基因型以及各种生态因素在塑造肠道原生动物群落中的作用对这些数据进行了讨论。
