As area-based PRRSV control and eradication programs move forward, the ability to minimize the risk of PRRSV-excretion into the environment from infected populations becomes important. This study evaluated the ability of models of biofilters and antimicrobial filters to reduce such risk. Under the conditions of this study, the specific biofilter tested was not able to significantly reduce the quantity of PRRSV in aerosols when compared to controls. In contrast, antimicrobial filters effectively prevented the excretion of PRRSV-contaminated aerosols into the environment. While further evaluation under field conditions is necessary, these results indicate there may be differences in the ability of commercially available technologies to reduce the risk of environmental contamination via PRRSV- positive exhausted air.
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