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Babesiosis is as one of the emerging human and animal diseases transmitted by ticks. It is caused intraerythrocytic parasites of the genus Babesia. Current evidence of human babesiosis suggests that the majority of cases are involved by Babesia divergens and Babesia microti piroplasms. As zoonotic reservoir of B. microti serve small mammals - insectivores and rodents. The occurrence of this parasite in natural environment in Poland is documented for various regions, in the wide range of mammal hosts. The most important role as Babesia microti reservoir play Microtus voles. The prevalence of infection in Microtus arvalis studied in Mazurian Lakeland is 9-33%; in Microtus agrestis in Katowice agglomeration reach almost 50%, Microtus oeconomus in Białowieża 7.7-50%. The lesser role as zoonotic reservoir play Clethrionomys voles, Apodemus mice and shrews; the prevalence of infections in these mammals don't exceed 2 %. The vectors for B. microti piroplasms in middle-European conditions are Ixodes ricinus, I. trianguliceps and Dermacentor reticulatus. There were recorded the infections of Ixodes ricinus ticks with B. microti in Szczecin and Tri-City, the rate was 6.2-13.3%. The variation in B. microti prevalence in rodents and ticks is very changeable and determined by season, the interaction with other hemoparasites, host's age and local conditions.
In the present note the first cases of Babesia microti infection of Clethrionomys glareolus in the district of Mazury Lakes is described. Contrary to other European countries, the zoonotic reservoir as well as epidemiological role of parasites from the genus Babesia spp. in Poland is entirely unknown.
A total of 1,367 Ixodes ricinus ticks collected from 5 districts of the Lublin region (eastern Poland) were examined for the presence of Babesia microti DNA by PCR and nested-PCR. As many as 74 ticks (5.4%) were found to be infected with Babesia microti. The infection rate varied significantly with stage/sex of ticks (chi2=16.48543, df=2, p<0.000264). The infection rates in females and males amounted to 6.4% and 8.8% respectively and were significantly higher (p=0.006 and p=0.0001 respectively) compared to minimum infection rate in nymphs that was equal to 2.8%. The prevalence of infection showed also a significant variability depending on geographic location within the Lublin region (chi2=18.62812, df=4, p<0.000932). The highest rates of infection with Babesia microti were noted in ticks collected from the areas of Puławy district situated in the northern part of region and the suburban Lublin district situated in the central part of the region (8.0% and 7.3% respectively). Mediocre infection rates (respectively 3.4% and 3.3%) were found in ticks from the Parczew and Włodawa districts situated in eastern part of the region and covered with humid lakeland forests. The lowest infection rate (0.5%) was noted in ticks from the Zamość district situated in southern part of the region. In conclusion, the infection rate of Ixodes ricinus ticks with Babesia microti found in this study is higher compared to the majority of data reported by Polish and other European authors, and indicates a potential risk of human infection during occupational or recreational exposure to tick bite.
In the suburban and urban forests in the cities of Gdańsk, Sopot and Gdynia (northern Poland), Ixodes ricinus ticks should be considered as the vector of pathogenic microorganisms that may cause significant diseases in wild and domestic animals and humans. These microorganisms include etiologic agents of Lyme disease, human anaplasmosis (HA) and babesiosis: Borrelia burgdorferi sensu lato, Anaplasma phagocytophilum and Babesia microti, respectively. DNA extracts from 701 ticks collected in 15 localities were examined by PCR for the simultaneous detection of these 3 pathogens. Overall, 14% were infected with A. phagocytophilum followed by 12.4% with B. burgdorferi s.l. and 2.3% with B. microti. In total, the percentage of infected females (32.9%) was 2.4 times higher than in males (13.7%) and 3.2 times higher than in nymphs (10.3%). Among adult ticks (n = 303), 8.3% were dually infected with A. phagocytophilum and B. burgdorferi s.l., 2.0% with the agent of human anaplasmosis and B. microti and 0.3% with borreliae and B. microti.
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Przypadek importowanej ludzkiej babesiozy w Polsce

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The first cae of human babesiosis in Poland imported from Brazil were ascertained in our Department. Diagnosis was based on hamster inoculation by intraperitonealy injection of patient's blood. In Giemsa stained erythrocytes characteristic forms of Babesia microti were detected.
We have designed and performed a new PCR method based on the 18S rRNA in order to individuate the presence and the identity of Babesia parasites. Out of 1159 Ixodes ricinus (Acari: Ixodidae) ticks collected in four areas of Switzerland, nine were found to contain Babesia DNA. Sequencing of the short amplicon obtained (411-452 bp) allowed the identification of three human pathogenic species: Babesia microti, B. divergens, for the first time in Switzerland, Babesia sp. EU1. We also report coinfections with B. sp. EU1-Borrelia burgdorferi sensu stricto and Babesia sp. EU1-B. afzelii.
The emergence of Lyme borreltosis as the most prevalent arthropod disease of humans in the temperate northern hemisphere has resulted in renewed interest in human babesiosis, transmitted by the same tick vectors. The advent of new molecular tools has made possible a reappraisal of the main parasites involved (Babesia divergens in Europe and Babesia microti in the USA). B. divergens is probably restricted to European cattle, though there are several nearly identical species. B. microti occurs as a world-wide species complex rather than as a single species, and although both pheno-typic and genotypie features lend support to suggestions that zoonotic B. microti may occur in Europe, convincing medical evidence is lacking. Comparative biology should support genetic data in taxonomic studies of these parasites.
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