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The aerosol survival in air was determined forPasteurella tularensis live vaccine strain (LVS) as a function of relative humidity (RH). Three different preparations of bacteria were used: (i) liquid suspension ofP. tularensis LVS in spent culture medium; (ii) powders ofP. tularensis LVS freeze-dried in spent culture fluid; (iii)P. tularensis LVS freeze-dried in spent culture fluid and then reconstituted with distilled water and disseminated as a liquid suspension. Preparation (i) gave greatest survival at high RH and lowest survival at intermediate RH. Preparation (ii), in contrast, gave greatest survival at low RH and minimum survival at 81% RH. Preparation (iii) was the same as preparation (i), i.e., the process of freeze-drying and reconstituting with distilled water before aerosol formation had little or no effect upon aerosol survival as a function of RH. Hence, control of aerosol survival appears to be through the water content ofP. tularensis LVS at the moment of aerosol generation rather than the water content of the bacteria in the aerosol phase.

Aerosol Survival of Pasteurella tularensis and the Influence of Relative Humidity