Abstract
Cryptosporidium parvum oocysts were detected in feces of dairy calves raised in Rio de Janeiro State and the risk factors involved in the infection were determined. A hundred calves aging up to 12-month-old from 13 dairy farms were sampled. Polymerase chain reaction was used to detect the presence of oocysts. The zoonotic C. parvum species was detected in 45% animals. Statistical risk factors analyses revealed an association between infection and animals raised in technical systems such as the use of milking equipment, milking cooler, and water trough(P<0.05)
Highlights
Protozoan from the genus Cryptosporidium causes diarrhea in a wide range of vertebrates including humans (Current et al, 1983). They have been reported in people from three days to 95 years old, the highest infection prevalence has been recognized in both children and young animals, and they are reported as a major cause of self-limiting diarrhea in immunocompetent people (Fayer et al, 1990; Chen et al, 2002)
Several factors were not associated with the shedding of C. parvum
Some other factors were significantly associated with the risk of C. parvum infection
Summary
Protozoan from the genus Cryptosporidium causes diarrhea in a wide range of vertebrates including humans (Current et al, 1983). They have been reported in people from three days to 95 years old, the highest infection prevalence has been recognized in both children and young animals, and they are reported as a major cause of self-limiting diarrhea in immunocompetent people (Fayer et al, 1990; Chen et al, 2002). Most human infections are due to C. parvum (Ramirez et al, 2004), and fecal food and drink contamination as well as person-to-person contact with oocysts are the most common methods of enteric protozoan transmission (Laubach et al, 2004). Dairy and beef calves are generally considered as presenting the highest risk because of their numbers, distribution, high infection occurrence, and high oocyst excretion levels (Kuczynska and Shelton, 1999), besides be exposed to contamination environment sources, such as soil and water
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