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Bacterial colonization of calves infected with M. avium subsp. paratuberculosis at very early times following infection. (A) Colonization of the ileum and mesenteric lymph nodes 1 h after inoculation of 109 CFU/animal for calf 1021 and inoculation of 108 CFU/animal for calves 1026 and 1027. (B) Colonization of calf 1022 organs 4 days after infection with 1010 CFU M. avium subsp. paratuberculosis. The error bars indicate standard errors of the means.
