![]() It must also be recognized that Brucella spp. There is evidence that this is not under the control of the rpoS gene, a major regulator of stationary phase growth and a stress response inducer in bacteria. Brucella suis also demonstrated an acid tolerance response with a 30-min exposure to pH 5.8, compared with a control (at optimum growth pH of 7.2), inducing a twofold increase in resistance to a pH value of 3.2. ![]() The same species showed 90% survival after 3 h exposure to pH 3.8 and this dropped to only 60% survival after 24 h. Rowe, in Encyclopedia of Food Microbiology (Second Edition), 2014 pH Valueīrucella abortus survived in a model system using sterilized milk and lactic acid for 34 days at a pH range of 5.0–5.8, but when the pH dropped to 3.9, the survival period decreased to only 2 days.
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