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The Survival of Escherichia coli in an Aerosol at Air Temperatures of 15 and 30 °C and a Range of Humidities

C. M. Wathes, K. Howard and A. J. F. Webster
The Journal of Hygiene
Vol. 97, No. 3 (Dec., 1986), pp. 489-496
Stable URL: http://www.jstor.org/stable/3863122
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Survival of Escherichia coli in an Aerosol at Air Temperatures of 15 and 30 °C and a Range of Humidities
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Abstract

The survival of Escherichia coli in an aerosol was studied at several temperatures and over a range of relative humidities using a Henderson apparatus. Death occurred in two phases, the first lasting approximately 1 min; in the second the number of viable microorganisms declined exponentially. E. coli was robust and remained viable for many hours. Death was most rapid at low humidities (<50% r.h.) at 15 and 30 °C, with half-lives of 14 and 3 min respectively. In humid conditions the half-lives were much longer, approximately 83 and 14 min respectively. Based on this work, preliminary recommendations for the climate of livestock buildings can now be given to control the airborne spread of E. coli.

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