Table 2.

Scores for necropsy grading system categorized by lesion severity and presence of acid-fast bacilli (AFB).

Severity	Gross	Microscopic	No. AFB
None	0	0	0.00
Mild	4	1	0.25
Moderate	8	2	0.50
Severe	12	3	0.75

Individual severity scores for each of the three categories were summed to achieve the final lesion score for each kid at necropsy. Lowest and highest possible scores using this system are 0.0 and 15.75, respectively. The relative number of AFB is given the least weight in this system since both paucibacillary and pleuribacillary forms of JD are recognized in some affected animals without an apparent major difference in disease severity.