Serological evaluation of relationship between viral pathogens (BHV-1, BVDV,BRSV, PI-3V,and Adeno3) and dairy calf pneumonia by indirect ELISA |
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Authors: | Roshtkhari Fatemeh Mohammadi Gholamreza Mayameei Ashraf |
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Institution: | (1) School of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran;(2) Department of Clinical Sciences, School of Veterinary Medicine, Ferdowsi University of Mashhad, P.O. Box: 91775-1793, Mashhad, Iran;(3) Department of Pathobiology, School of Veterinary Medicine, Ferdowsi University of Mashhad, P.O. Box: 91775-1793, Mashhad, Iran; |
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Abstract: | In this study, viral pathogens associated with nine outbreaks of naturally occurring dairy calf pneumonia in Mashhad area
of Khorasan Razavi province from September 2008 to May 2009 were assessed. Five diseased calves from each farm were chosen
for examination. Acute and convalescent serum samples were taken from calves with signs of respiratory disease. Sera were
analyzed for antibodies to bovine viral diarrhea virus (BVDV), bovine herpesvirus type 1 (BHV-1), bovine respiratory syncytial
virus (BRSV), parainfluenza virus type 3 (PI-3V), and bovine adenovirus-3 (BAV-3) by indirect ELISA kits. Among 42 serum samples
collected at sample 1, seroprevalence values for viruses BHV-1, BVDV, BRSV, PI-3V, and BAV-3 were 61.9% (26), 57.1% (24),
64.2% (27), 90% (38), and 61.9% (26), respectively. Seroconversion to BVDV, BRSV, PI-3V, and BAV-3 occurred in 11.9% (5),
16.6% (7), 26.1% (11), and 21.4% (9) of animals, and 52.3% (22) had generated antibodies against one or more viral infections
at sample 2. In addition, no significant relationship between seroprevalence of BHV-1, BVDV, BRSV, PI-3V, and BAV-3 and dairy
herd size was observed (P > 0.05). According to serological findings, BHV-1, BVDV, BRSV, PI-3V, and BAV-3 are common pathogens of the dairy calf pneumonia
in dairy herds in Mashhad area of Khorasan Razavi province, Iran. |
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