Coccidia Lesion Scoring

[Amir Sohel]

Thanks for good sharing Asia

[Jeffery Escobar]

The lesion score system of Johnson and Reid (1970) has become the gold standard around the world. The scoring system assigns values between 0 and 4 for E. acervulina, E. maxima, E. tenella, E. necatrix, E. mivati, and E. brunetti. The description of each lesion score can be found in the attached publication.

Cocci-lesion-scores-Johnson-Reid-1970.pdf 2 MB PDF - Click to view

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[Muhammad Ahmad]

The primary method for assessing coccidial infections is the Johnson and Reid (1970) lesion scoring system. This widely-used method is based on a visual examination of the intestines to evaluate the gross lesions caused by different Eimeria species.

The scoring system assigns a score from 0 to 4 to specific parts of the intestine, with each score corresponding to a different level of disease severity:

* Score 0: No visible lesions.

* Score 1: Scattered lesions with no significant damage to the gut wall.

* Score 2: Numerous lesions with slight gut wall thickening.

* Score 3: Extensive and coalescing lesions with significant gut wall thickening and signs of advanced disease, such as bloody contents or watery exudate.

* Score 4: Severe damage with extensive hemorrhages, large blood clots, or caseous cores, often leading to mortality.

The system is species-specific, meaning the scoring criteria vary depending on which Eimeria species is being evaluated. For example, lesions caused by Eimeria acervulina are scored in the duodenum, while those from Eimeria tenella are evaluated in the caeca. This systematic approach allows for a standardized and reproducible assessment of anticoccidial drug efficacy and the severity of field infections.The primary method for assessing coccidial infections is the Johnson and Reid (1970) lesion scoring system. This widely-used method is based on a visual examination of the intestines to evaluate the gross lesions caused by different Eimeria species.
The scoring system assigns a score from 0 to 4 to specific parts of the intestine, with each score corresponding to a different level of disease severity:
* Score 0: No visible lesions.
* Score 1: Scattered lesions with no significant damage to the gut wall.
* Score 2: Numerous lesions with slight gut wall thickening.
* Score 3: Extensive and coalescing lesions with significant gut wall thickening and signs of advanced disease, such as bloody contents or watery exudate.
* Score 4: Severe damage with extensive hemorrhages, large blood clots, or caseous cores, often leading to mortality.
The system is species-specific, meaning the scoring criteria vary depending on which Eimeria species is being evaluated. For example, lesions caused by Eimeria acervulina are scored in the duodenum, while those from Eimeria tenella are evaluated in the caeca. This systematic approach allows for a standardized and reproducible assessment of anticoccidial drug efficacy and the severity of field infections.