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Evaluation of the Long–Term Effect of Air Filtration on the Occurrence of New PRRSV Infections

16 May 2012, at 12:00am

Air filtration had a long–term effect in reducing the occurrence of new porcine reproductive and respiratory syndrome virus (PRRSV) infections in large breeding herds in regions densely populated with pigs, according to new research from Minnesota, US.

Airborne transmission of PRRSV is a risk factor for the infection of susceptible populations. Therefore, Scott Dee of Pipestone Veterinary Clinic in Pipestone, Minnesota and co-authors there and from Boehringer–Ingelheim, Swine Vet Center in St Peter, Fairmont Veterinary Clinic in Fairmont and the University of Minnesota College of Veterinary Medicine in St Paul carried out a long-term sustainability study of air filtration as a means to reduce this risk.

In their paper published in the journal, Viruses, they explain that participating herds (n=38) were organised into four independent cohorts and the effect of air filtration on the occurrence of new PRRSV infections was analysed at three 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).

The Minnesota–based group concluded that, across all three levels of analysis, the long–term effect of air filtration on reducing the occurrence of new PRRSV infections in the study population was demonstrated.

For more information, please click here.

Reference

Dee S., J.P. Cano, G. Spronk, D. Reicks, P. Ruen, A. Pitkin and D. Polson. 2012. 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, 4(5):654-662. doi:10.3390/v4050654

Further Reading

- You can view the full report by clicking here.


Further Reading

- Find out more information on porcine reproductive respiratory syndrome (PRRS) by clicking here.


May 2012