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Bovine viral diarrhoea virus and other reproductive pathogens

epidemiological studies in Peruvian cattle

Ståhl, Karl (2006). Bovine viral diarrhoea virus and other reproductive pathogens. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2006:53
ISBN 91-576-7102-8
[Doctoral thesis]

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Abstract

This thesis deals with aspects of the epidemiology of bovine viral diarrhoea virus (BVDV) of relevance to control, with particular focus on the situation in Peruvian smallholder dairy farms. In addition, the importance of Neospora caninum and bovine herpesvirus type 1 (BHV-1) is addressed, as these are important differential diagnoses to BVDV. The prevalence of BVDV and BHV-1 was studied in smallholder dairy farms in a rural area. Using bulk tank milk testing for detection of antibodies it was shown that the prevalence of active BVDV infection was low, and that a large proportion of the herds were free from BHV-1. A study of the BVDV situation in the major dairy region in the country demonstrated a very high level of exposure to BVDV. Individual testing of young stock indicated, however, that many herds might be cleared from BVDV without intervention, and that a long-term reduction in prevalence can be achieved as long as adequate attention is given to systematic measures aimed at preventing re-introduction of infection. An endemic abortion problem in a dairy herd with concurrent infections with Neospora caninum and BVDV was investigated. Using a prospective seroepidemiological approach it was possible to estimate the magnitude of associations between the infections and risk of abortion, and to demonstrate that Neospora caninum infection significantly affected the risk within the herd. Evidence of active BVDV infection, on the other hand, was not associated with abortions. The phylogenetic analysis of BVDV strains isolated from animals detected as persistently infected, demonstrated that all belonged to genotype 1, subtype 1b. The genetic similarity with previously described strains reflected the role of livestock trade for the diversity of BVDV. Imported livestock is the probable source of BVDV strains circulating in the country, and this was supported by the phylogenetic analysis. Finally, it was demonstrated that a molecular epidemiological approach might be used to trace routes of transmission, and to identify and prevent risky behaviour.

Authors/Creators:Ståhl, Karl
Title:Bovine viral diarrhoea virus and other reproductive pathogens
Subtitle:epidemiological studies in Peruvian cattle
Year of publishing :May 2006
Volume:2006:53
Number of Pages:44
Papers/manuscripts:
NumberReferences
ALLI. Ståhl K., Rivera H., Vågsholm I., and Moreno-López J. (2002). Bulk milk testing for antibody seroprevalences to BVDV and BHV-1 in a rural region of Peru. Preventive Veterinary Medicine 56 (3), 193-202. II. Ståhl K., Lindberg A., Rivera H., Ortiz C., and Moreno-Lopéz J. Self clearance from bovine viral diarrhoea virus (BVDV) infections - a prevalent finding in an endemically infected dairy region in Peru. (Manuscript). III. Ståhl K., Björkman C., Emanuelson U., Rivera H., Zelada A., and Moreno-Lopéz J. (2006). A prospective study of the effect of Neospora caninum and BVDV infections on bovine abortions in a dairy herd in Arequipa, Peru. Preventive Veterinary Medicine (In print). IV. Ståhl K., Benito A., Felmer R., Zuñiga J., Reinhardt G., Rivera H., Baule C., and Moreno-Lopéz J. Genetic diversity of BVDV isolates from Peru and Chile. (Manuscript). V. Ståhl K., Kampa J., Baule C., Isaksson M., Moreno-López J., Belak S., Alenius S., and Lindberg A. (2005). Molecular epidemiology of Bovine Viral Diarrhoea during the final phase of the Swedish BVD-eradication programme. Preventive Veterinary Medicine 72 (1-2) 103-108.
Place of Publication:Uppsala
ISBN for printed version:91-576-7102-8
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:cattle, diarrhoea, viroses, neospora caninum, bovine herpesvirus, phylogeny, epidemiology, disease transmission, disease control, herds, peru
Keywords:BVDV, self-clearance, control, phylogenetic analysis, Neospora caninum, BHV-1, Arequipa, Peru
URN:NBN:urn:nbn:se:slu:epsilon-1085
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-1085
ID Code:1146
Department:(VH) > Dept. of Biomedical Sciences and Veterinary Public Health
Deposited By: Karl Ståhl
Deposited On:01 Jun 2006 00:00
Metadata Last Modified:02 Dec 2014 10:09

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