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Table 2 Macroscopic lesions of MAP infection in calves (according to age and dose groups)

From: Evaluation of age-dependent susceptibility in calves infected with two doses of Mycobacterium avium subspecies paratuberculosis using pathology and tissue culture

Macroscopic lesions* Control Low dose High dose
2 weeks 3 months 6 months 9 months 12 months 2 weeks 3 months 6 months 9 months 12 months
0 6 1 1 3 5 2   1 2 3 1
1   1 1 1      1   
2    1     1     
3   3 2 1   3 2 4 2 2 4
4        2     
  1. *0 = no macroscopic changes; 1 = one enlarged or edematous lymph node of the small intestine or liver; 2 = multiple enlarged and edematous mesenteric lymph nodes and/or hyperemia of the ileocaecal valve; 3 = enlarged mesenteric lymph node(s) and/or mild to moderate thickening of ileal or jejunal mucosa; 4 = enlarged mesenteric lymph node(s) and severe thickening and corrugation of the ileal, jejunal and colon mucosa.