Airborne Survival of Rift Valley Fever Virus
ARMY MEDICAL RESEARCH INST OF INFECTIOUS DISEASES FORT DETRICK MD
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The aerosol stability characteristics of an Egyptian isolate of Rift Valley fever virus ZH-501 strain were determined in a static aerosol chamber. Aerosolized particles had a mass median diameter of 4.0 micrometers. At 30, 55, 80 relative humidity RH the biological decay rate was 0.9, 4.1, and 10.1 per min, respectively. The decay rate data tested significantly different P 0. 001 at each RH. The biological half-life values were 6.9 min at 80 RH, 15.8 min at 55, and 77.0 min at 30 RH. Comparable decay rates were obtained with a strain SA-51 isolated in South Africa in 1951.