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Peculiarities of Trypanosoma rangeli KP1(–) strains isolated from the wild rodent Phyllomys dasythrix (Santa Catarina, Brazil): Comparisons with T. rangeli KP1(+) strains and Trypanosoma lewisi (Kinetoplastea, Trypanosomatidae)

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Sousa M. A. , Santos B. N. , Carvalhal C. , Steindel M.

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Blood parasites in a wild rodent community of Mazury lakes District, Poland

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Bajer A. , Bednarska M. , Pawelczyk A. , Konopka E. , Karbowiak G. , Sinski E.

nr 3

Two-year study of examination of blood from wild rodents for the presence of antiborrelian antibodies

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Vostal K. , Zakovska A.

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Environmental survey for Cryptosporidium sp. of wild rodents in the District of Mazury Lakes, Poland

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Sinski E. , Bednarska M. , Grygierczyk D. , Bajer A.

nr 3

Experimental transmission of Cryptosporidium parvum isolates from wild rodents and calves to laboratory bred common voles [Microtus arvalis]

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Donskow K. , Bajer A. , Bednarska M. , Sinski E.

nr 1

The oocysts of Cryptosporidium parvum isolated from Microtus arvalis, Clethrionomys glareolus and calves were used in laboratory experiments carried out on 35 M. arvalis. Oocysts were detected in 43% of 14 voles infected with C. parvum derived from calves and in 54% of 13 voles infected with C. parvum isolates from C. glareolus. All voles inoculated with oocysts from M. arvalis (MA-voles) developed infection. There were observed differences in courses of infection between the three groups of voles with MA-voles demonstrating the most typical curve with an acute phase of infection in the first 4 weeks and a 2-week- long phase of self-curing. The infections with 'heterologous' C. parvum isolates (C. glareolus and calf isolates) transformed into chronic infections with lower oocyst productions. A strong host age effect was observed on prevalence of C. parvum among voles of different ages. Eight-month-old voles did not become infected and in older animals the infections were milder. The successful cross-transmission of two C. parvum isolates to M. arvalis suggests that this species should be considered as reservoir host for this important parasite of humans and animals.