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Mean rectal temperatures of calves following oral inoculation with either S. typhimurium ST4/74 (wild type) (solid line) or its derivative invH mutant (dotted line). Each datum point up to and including that for 48 h is derived from three calves for the wild-type strain and four calves for the invH mutant. After this time, the data for the wild-type strain are from only one calf and the data for the invH mutant are from two calves.
