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Pathogenicity of serotype-2, -4, -8a and -8b strains in Partridge Shank broilers. (A) Percent survival of chickens challenged by the four serotypes, respectively. The comments in brackets indicate the serotype of the challenge strains. (B) Mean lesion scores of chickens challenged by each of the four serotypes, respectively. Mean lesion scores reflected the mean scores of gross lesions.
