Influence of microclimate conditions on the cumulative exposure of nursery pigs to swine influenza A viruses
| Autor: | Éva Nagy, J. B. Ferreira, Zvonimir Poljak, Robert M. Friendship, Helena Grgić |
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| Rok vydání: | 2017 |
| Předmět: |
0301 basic medicine
Veterinary medicine Hemagglutination Swine 030106 microbiology Microclimate Cumulative Exposure Antibodies Viral Virus 03 medical and health sciences Influenza A Virus H1N1 Subtype Orthomyxoviridae Infections Seroepidemiologic Studies Seroprevalence Animals Ontario Swine Diseases General Veterinary General Immunology and Microbiology biology Incidence (epidemiology) Influenza A Virus H3N2 Subtype Temperature Humidity General Medicine Hemagglutination Inhibition Tests Virology 030104 developmental biology Cross-Sectional Studies Herd biology.protein Female Antibody |
| Zdroj: | Transboundary and emerging diseases. 65(1) |
| ISSN: | 1865-1682 |
| Popis: | The objective of this study was to investigate the association between environmental temperature and humidity and the presence of antibodies for two specific strains of swine influenza viruses: A/SW/ON/105-56/12/H3N2 (H3N2_D) and A/SW/ON/84/2012/H1N1 (H1N1_P). A cross-sectional study was performed in a commercial farm, and a total of 450 pigs at 10 weeks of age were blood sampled, by sampling 10 pigs per week for 45 weeks corresponding to 45 batches. Exposure of pigs to H3N2_D and H1N1_P virus was assessed by haemagglutination inhibition assay (HI), and a result of ≥1:40 was considered as indication of a positive exposure status for a specific strain. The selection of those two viruses was based on the fact that H1N1 was the dominant virus in Ontario herds, and H3N2 had been previously isolated in this particular farm. Environmental conditions were recorded through a portable device every 5 min and then summarized using descriptive statistics. The association between HI titres and environmental microconditions, in the nursery, was evaluated through random effect linear and logistic regression. The results showed that the prevalence for H1N1_P was high throughout the study (≥70%); however, for H3N2_D, the seroprevalence declined by the end of the study period. Results also showed an association between cumulative exposure to the viruses and temperature and relative humidity (p |
| Databáze: | OpenAIRE |
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