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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.
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Veterinary Research

ISSN: 1297-9716