BVDV and BHV-1 Infections in Dairy Herds in Northern and Northeastern Thailand |
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Authors: | J Kampa K Ståhl J Moreno-López A Chanlun S Aiumlamai S Alenius |
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Institution: | (1) Division of Parasitology and Virology, Department of Biomedical Sciences and Veterinary Public Health, Swedish University of Agricultural Sciences, Uppsala, Sweden;(2) Department of Pathobiology, Faculty of Veterinary Medicine, Khon Kaen University, Thailand;(3) Department of Ruminant Medicine and Veterinary Epidemiology, Faculty of Veterinary Medicine and Animal Science, Swedish University of Agricultural Sciences, Uppsala, Sweden;(4) Department of Medicine, Faculty of Veterinary Medicine, Khon Kaen University, Thailand;(5) Department of Surgery and Theriogenology, Faculty of Veterinary Medicine, Khon Kaen University, Thailand; |
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Abstract: | Bulk milk samples from 220 dairy herds were collected at 9 public milk collection centres in the northeastern and northern
Thailand, and a subset of 11 herds was selected for individual testing. The samples were tested for presence of antibodies
to BVDV and BHV-1 using an indirect ELISA. The results from the bulk milk testing demonstrated a moderate level of exposure
to BVDV and BHV-1 (73% and 67%, respectively). However, the low proportion of herds with high BVDV antibody-levels (13%) and
the low within-herd seroprevalence of BVDV and BHV-1 in the 11 herds (24% and 5%, respectively), particularly among the young
stock (15% and 0%, respectively), demonstrated a low prevalence of active BVDV infection and a low rate of reactivation of
latent BHV-1. The presence of a self-clearance process was also indicated by the results from the individual testing. Moreover,
a surprisingly low prevalence of BVDV and BHV-1 antibody-positive herds at one of the milk centres was found. This centre
was established 5–10 years before the others. Our impression is that this reflects the self-clearance process, where consecutive
replacement of imported infected animals without further spread has resulted in a nearly total elimination of the infections. |
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