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Table 2 Scoring system for experimental necrotic enteritis lesions (slightly modified from[32]) proposed for international adoption

From: The successful experimental induction of necrotic enteritis in chickens by Clostridium perfringens: a critical review

Score Lesion Number of lesions
0 No gross lesions -
1 Thin or friable walls, or diffuse superficial but removable fibrin -
2 Focal necrosis or ulceration, or non-removable fibrin deposit 1 to 5 foci
3 Focal necrosis or ulceration, or non-removable fibrin deposit 6 to 15 foci
4 Focal necrosis or ulceration, or non-removable fibrin deposit 16 or more foci
5 Patches of necrosis 2 to 3 cm long Variable
6 Diffuse necrosis typical of field cases Variable, but extensive