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Viruses 2012, 4(5), 654-662; doi:10.3390/v4050654
Article

Evaluation of the Long-Term Effect of Air Filtration on the Occurrence of New PRRSV Infections in Large Breeding Herds in Swine-Dense Regions

1,* , 2
,
1
,
3
,
4
,
4
 and
2
1 Pipestone Veterinary Clinic, Pipestone, MN 56164, USA 2 Boehringer-Ingelheim, St Joseph, MO 64501, USA 3 Swine Vet Center, St. Peter, MN 56082, USA 4 Fairmont Veterinary Clinic, Fairmont, MN 56031, USA
* Author to whom correspondence should be addressed.
Received: 20 March 2012 / Revised: 21 April 2012 / Accepted: 24 April 2012 / Published: 26 April 2012
(This article belongs to the Special Issue Animal Arteriviruses and Coronaviruses)
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Abstract

Airborne transmission of porcine reproductive and respiratory syndrome virus (PRRSV) is a risk factor for the infection of susceptible populations. Therefore, a long‑term sustainability study of air filtration as a means to reduce this risk was conducted. Participating herds (n = 38) were organized into 4 independent cohorts and the effect of air filtration on the occurrence of new PRRSV infections was analyzed at 3 different levels from September 2008 to January 2012 including the likelihood of infection in contemporary filtered and non-filtered herds, the likelihood of infection before and after implementation of filtration and the time to failure in filtered and non-filtered herds. Results indicated that new PRRSV infections in filtered breeding herds were significantly lower than in contemporary non-filtered control herds (P < 0.01), the odds for a new PRRSV infection in breeding herds before filtration was 7.97 times higher than the odds after filtration was initiated (P < 0.01) and the median time to new PRRSV infections in filtered breeding herds of 30 months was significantly longer than the 11 months observed in non-filtered herds (P < 0.01). In conclusion, across all 3 levels of analysis, the long-term effect of air filtration on reducing the occurrence of new PRRSV infections in the study population was demonstrated.
Keywords: porcine; reproductive; respiratory; syndrome; virus; air; filtration; breeding; herds porcine; reproductive; respiratory; syndrome; virus; air; filtration; breeding; herds
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).
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Dee, S.; Cano, J.P.; Spronk, G.; Reicks, D.; Ruen, P.; Pitkin, A.; Polson, D. Evaluation of the Long-Term Effect of Air Filtration on the Occurrence of New PRRSV Infections in Large Breeding Herds in Swine-Dense Regions. Viruses 2012, 4, 654-662.

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