Abstract
SUMMARY Aerosols of respiratory syncytial virus were kept at different relative humidities (RH). Viability was studied by a plaque method. Virus recoveries I min. after aerosolization were highest at high RH. The stability of the aerosol was maximal at 60 ~ RH. The total decay after 61 min. varied from I- I log. p.f.u, to 2"5 log. p.f.u., with peak values at 30 ~o RH (2- 3 log. p.f.u.) and 8o ~o RH (2"5 log. p.f.u.), suggesting two processes with different kinetics. Oxidation was excluded as a cause of inactivation by experiments in pure nitrogen.
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