Zoonotic Protozoan Parasites in Cattle: Emerging Issues by M.E. Olson - PDF only. In: Proceedings of the 23rd World Buiatrics Congress, Canada, 2004

Cattle are frequently parasitized with an number of protozoan parasites but Giardia duodenalis, Cryptosporidium parvum and Cryptosporidium andersoni are of major zoonotic concern. These parasites case diarrhoea and impair body weight gain. Giardia and Cryptosporidium from cattle are potential zoonotic pathogens and contact with animals, manure or contaminated water is believed to lead to infections in humans. Molecular epidemiology has suggested that cattle are not as significant of a reservoir for human infections as was once believed. Most Giardia duodenalis from cattle (Assemblage E) is different from that found in humans (Assemblage A and B) and Cryptosporidium andersoni does not infect humans. Molecular tools have shown that humans can be infected with zoonotic C. parvum as well as anthroponotic C. hominis. RésuméLes ruminants sont souvent parasités par des protozoaires mais Giardia duodenalis,Cryptosporidium parvum et Cryptosporidium andersoni sont sans doute les plus importants dupoint de vue zoonotique. Ces parasites causent des diarrhées et des pertes de poids chez lesbovins et les humains peuvent être infectés par contact avec les animaux, leurs déjections etl’eau. L’épidémiologie moléculaire suggère toutefois un impact minime sur les infections chezl’homme. Les types moléculaires (assemblages A et B) retrouvés chez les Giardia duodenalisisolés des bovins et ceux de Cryptosporidium andersoni ne sont pas retrouvés chez l’hommealors que celui-ci peut être atteint des cryptosporidioses causées par C. Parvum et C. hominis. References1 Thompson, RCA. (2003) Molecular epidemiology of Giardia and Cryptosporidiuminfections. J. Parasitol. 89, S134-1402 Olson, M.E. et al (2004) Update on Cryptosporidium and Giardia infection in cattle. TrendsParasitol. (in press)3 Hijjawi, N.S. et al. (2002) Successful in vitro cultivation of Cryptosporidium andersoni:Evidence for the existence of novel extracellular stages in the life cycle and implicationsfor the classification of Cryptosporidium. Int. J. Parasitol. 32, 1719-17264 Morgan-Ryan, U.M. et al. (2002) Cryptosporidium hominis n. sp. (Apicomplexa:Cryptosporidiidae) from Humans, Homo sapiens, J. Euk. Microbiol. 49, 433-440Published in IVIS with the permission of the WBCClose window to return to IVIS