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Mechanism of Inactivation in Aerosols of Bacteriophage T₁

Laboratory of Microbiology, State University, Catharijnesingel 59, Utrecht, The Netherlands

The inactivation of Escherichia coli bacteriophage T₁ was determined after formation of aerosols from solutions in NaCl, NaBr, NaNO₃ and Na₂SO₄. In all cases, survival varied rapidly with relative humidity, with a minimum near the relative humidity corresponding to a saturated solution of the salt. Survival was better when the aerosol was formed at low initial salt concentrations. Broth protected against aerosol-inactivation. Phage particles surviving surface-inactivation by shaking in solution were resistant to aerosol-inactivation.

The inactivation process in the range of humidities where the aerosol particles are fluid seems mainly to be due to surface-inactivation.

Received 15 November 1971; accepted 28 January 1972.

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