Avaliaram-se as condições sanitárias de 13 biotérios de nove instituições públicas do estado de Minas Gerais, bem como a presença de endo e ectoparasitos nos camundongos e ratos criados nesses biotérios. Os dados sobre barreiras contra infecções e sobre o programa de monitoramento sanitário dos animais foram obtidos por meio de um questionário e de visitas aos biotérios. Métodos parasitológicos foram utilizados para o diagnóstico de ácaros, piolhos, helmintos e protozoários em 344 camundongos e 111 ratos. A maioria dos biotérios não possuía espaços físicos adequados nem barreiras de proteção que pudessem impedir a transmissão de infecções. Os resultados parasitológicos mostraram que em apenas um biotério não foram encontrados animais parasitados. A prevalência de parasitos encontrados em camundongos nos outros biotérios foi: Myobia musculi (23,1%), Myocoptes musculinus (38,5%), Radfordia affinis (15,4%), Syphacia obvelata (92,3%), Aspiculuris tetraptera (23,1%), Hymenolepis nana (15,4%), Spironucleus muris (46,2%), Giardia muris (46,2%), Tritrichomonas muris (53,8%), Trichomonas minuta (61,5%), Hexamastix muris (7,7%) e Entamoeba muris (84,6%). E nas colônias de ratos foram encontrados: Poliplax spinulosa (8,1%), Syphacia muris (46,2%), Trichosomoides crassicauda (28,6%), Spironucleus muris (85,7%), Tritrichomonas muris (85,7%), Trichomonas minuta (85,7%), Hexamastix muris (14,3%) e Entamoeba muris (85,7%).

The sanitary conditions of 13 animal houses in nine public institutions in Minas Gerais, and the presence of endo and ectoparasites of mice and rats colonies kept in these facilities were evaluated. Data about barriers to prevent the transmission of diseases and a program of sanitary monitoring were obtained through a questionnaire and local visit. Parasitological methods were performed for diagnosing mite, lice, helminthes, and protozoa parasites in 344 mice and 111 rats. Data have shown that the majority of the animal houses had neither proper physical environment nor protection barriers to prevent the transmission of infections. Parasitological results have shown that only one animal house (7.7%) had parasite free animals, whereas the others have presented infected animals and the prevalences of parasites in the mice colonies were: Myobia musculi (23.1%); Myocoptes musculinus (38.5%); Radfordia affinis (15.4%); Syphacia obvelata (92.3%); Aspiculuris tetraptera (23.1%); Hymenolepis nana (15.4%); Spironucleus muris (46.2%); Giardia muris (46.2%); Tritrichomonas muris (53.8%); Trichomonas minuta (61.5%); Hexamastix muris (7.7%); and Entamoeba muris (84.6%). As for the rat colonies, the prevalences were: Poliplax spinulosa (8.1%); Syphacia muris (46.2%); Trichosomoides crassicauda (28.6%); Spironucleus muris (85.7%); Tritrichomonas muris (85.7%); Trichomonas minuta (85.7%); Hexamastix muris (14.3%) and Entamoeba muris (85.7%).

The objective of the present study was to evaluate parasitemia and packed cell volume patterns of dogs experimentally inoculated with two isolates of Babesia canis: one from Belo Horizonte (BH) and the other from Lavras (Lv), Minas Gerais State, Brazil. Both isolates showed similar patterns, with the peak of parasitemia occurring three days post-infection. From the fourth day, parasitemia was detected in low levels (0.01%) with small periodical increases. The packed cell volume decreased after the parasitemia beginning, with oscillations during the experimental period. All dogs remained apparently normal, except one, which had been inoculated with the BH isolate and presented classical clinical signs of babesiosis (weakness, anemia, hemoglobinuria and depression). The results suggest that the studied isolates have low pathogenicity, and point to the need for further studies aiming to characterize the subspecies of Brazilian isolates.

Avaliou-se a ação de cinco acaricidas em ovos, larvas, ninfas e adultos do carrapato Rhipicephalus sanguineus. Os produtos testados foram: cipermetrina high cis (0.01%) + DDVP (0.11%), coumaphos (0.05%), deltametrina (0.0025%), amitraz (0.025%) e cipermetrina (0.015%). Os ovos tratados com cipermetrina high cis e cipermetrina mostraram inibição de eclosão de 72,1% e 67,3%, respectivamente, enquanto coumaphos resultou em baixa eficiência (11,7%). Exceto para ninfas (63,3%) e para fêmeas não alimentadas (80,0%) expostas ao coumaphos, todos os outros estádios de carrapato e fêmeas não alimentadas foram sensíveis a todos os produtos químicos testados.

The action of five acaricides was evaluated on eggs, larvae, nymphs and adults of the ixodid tick Rhipicephalus sanguineus. The acaricides tested were: high cis-cypermethrin (0.01%) + DDVP (0.11%), coumaphos (0.05%), deltamethrin (0.0025%), amitraz (0.025%) and cypermethrin (0.015%). Eggs treated with high cis-cypermethrin and cypermethrin showed eclosion inhibitions of 72.1% and 67.3%, respectively, whereas coumaphos was much less effective (only 11.7%). Except for coumaphos, which resulted in 63.3% and 80.0% mortality of nymphs and unfed females, respectively, all compounds tested killed 100% of all tick stages to which they were exposed.