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Kjellén, Anna (2007) Cryptosporidium parvum infection in dairy calves in South Vietnam. Other thesis, SLU.

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Infectious diarrhoea of neonatal calves is common worldwide. Several pathogens, e.g. rotavirus and coronavirus, enterotoxigenic Eschericia coli bacteria and the protozoan parasite Cryptosporidium parvum have the potential to cause diarrhoea in calves. In this study, which was part of a larger project on calf diarrhoea in South Vietnam, the occurrence of C. parvum in dairy calves was investigated. One hundred and twenty faecal samples were collected from dairy calves in 4 state farms, each housing several hundred cows, and 35 household farms with 1- 100 cows in 6 districts between September and November 2006. Both diarrhoeic and non-diarrhoeic calves, aged 1-60 days, were sampled. Fifty seven samples were collected from state farms and 63 samples were collected from household farms. Analyses were conducted by C. parvum antigen ELISA. The samples were also used in a cooperating study to estimate the prevalence of rotavirus. In total, 10 samples (8%) were positive for C. parvum, 3 of these were co-infected with rotavirus. Forty five samples were from calves with diarrhoea. Four of them were infected by C. parvum, and another 2 were co-infected with C. parvum and rotavirus. Of the 75 samples collected from clinically healthy calves, 3 had C. parvum only and 1 was co-infected with C. parvum and rotavirus. Eight (80%) of the C. parvum positive samples were collected in state farms and the remaining two were from household farms with 5-20 cows. The 3 samples that were coinfected with C. parvum and rotavirus were from state farm calves. The average occurrence of diarrhoea among the calves sampled in state farms was 54%, whereas 25% of calves sampled in household farms were diarrhoeic. The results show that C. parvum and rotavirus are present among calves in South Vietnam and might have clinical significance. They indicate that calves in large sized state farms are infected by C. parvum to a higher extent than calves in household farms, and also that calf diarrhoea is more common in the state farms.

Item Type: Thesis (Other)
Keywords: Cryptosporidium parvum, neonatal diarrhoea, calf, Vietnam
Subject (faculty): Faculty of Veterinary Medicine and Animal Science > Dept. of Clinical Sciences
Divisions: SLU > Faculty of Veterinary Medicine and Animal Science
Depositing User: Anna Kjellén
Date Deposited: 30 May 2007
Last Modified: 18 Aug 2015 09:51
URI: http://ex-epsilon.slu.se/id/eprint/1676

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