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Appl Environ Microbiol. 1972 March; 23(3): 505-508
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Efficiency of Commercial Air Filters Against Marek's Disease Virus

Regional Poultry Research Laboratory, U.S. Department of Agriculture, East Lansing, Michigan 48823

ABSTRACT

In a series of 10 replicate trials with susceptible chickens as indicators of the presence of virus in the air, filter B₁ (Dri Pak, American Air Filter Co.), which has a dust spot rating of 93 to 97%, and filter C (Astrocel), with a dioctyl phathalate aerosol rating of over 99%, completely removed Marek's disease virus (MDV) from highly contaminated air. However, air passed through filter B₂ (Duracel), with a dust spot rating of 34 to 45%, remained infectious. Thus, an air filter with a dust spot rating of over 93% will effectively remove MDV from the air. The smallest infectious particles in the air are estimated to be greater than 0.3 µm in diameter.