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Survival of representative Brucella strains in minimal medium at pH 2.5 with 1.5 mM Glu. Decrease of viability during the acid shock (at the indicated time, T) was expressed as a log10 of the number of CFU (CFU/ml) at each time point (30, 60, and 120 min) versus bacteria present at time zero. B. abortus S19 and ATCC 23488 (544), B. neotomae 5K33, and B. ovis ATCC 25840 strains have the same acid-sensitive phenotypes as B. suis bv. 1, 1330 and B. melitensis 16M.
