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Survival of serovar Typhimurium in synthetic gastric fluid containing lactic acid. Wild-type serovar Typhimurium UK1 (SX 2) was grown to mid-log phase, adapted at pH 4.4 for 1 h, pelleted, and resuspended in an equal volume of synthetic gastric fluid at pH 3.87 containing lactic acid at 0, 5, 10, or 20 mM. Viable counts were determined at 0, 15, 30, 60 and 90 min for determination of percent survival.
