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The influence of temperature and humidity on spore formation and germination in Bacillus anthracis

Published online by Cambridge University Press:  15 May 2009

D. G. Davies
D. G. Davies
Affiliation:
Public Health Laboratory, Carlisle
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Experiments performed on spore formation in B. anthracis, in a wide range of closed atmospheres of chemically controlled humidity, showed that the sporing time of B. anthracis is prolonged considerably as the humidity decreases, both at 26 and 37° C. The effect is less noticeable at the lower temperature.

Experiments performed on spore germination in the same organism showed that a temperature range of 20–44° C. permitted germination of the five strains tested. Above a temperature of 39° C. and below 30° C. germination time lengthened considerably.

Experiments performed on the influence of humidity on spore germination, both at 26 and 37° C. showed that no germination could take place at a relative humidity of 80% or below. Germination time was considerably prolonged when the humidity value fell below 100%.

This work formed part of a thesis for the degree of M.D. in Bristol University. I wish to thank Dr G. S. Wilson for his advice in preparing this paper.

Type
Research Article
Information
Journal of Hygiene , Volume 58 , Issue 2 , June 1960 , pp. 177 - 186
Copyright
Copyright © Cambridge University Press 1960

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