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

Scott Dee²  Jean Paul Cano¹  Gordon Spronk²  Darwin Reicks⁴  Paul Ruen³  Andrea Pitkin³ 

[1] Boehringer-Ingelheim, St Joseph, MO 64501, USA;Pipestone Veterinary Clinic, Pipestone, MN 56164, USA;Fairmont Veterinary Clinic, Fairmont, MN 56031, USA;Swine Vet Center, St. Peter, MN 56082, USA;

关键词: porcine;    reproductive;    respiratory;    syndrome;    virus;    air;    filtration;    breeding;    herds;   

DOI  :  10.3390/v4050654

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland.