Abstract

The pathogenicity of three strains of Eimeria mivati (two chicken-maintained strains and an embryo-adapted strain) and one strain of E. acervulina has been examined. Based on body weight changes of Light Sussex chickens, the chicken-maintained strains of E. mivati were more pathogenic than E. acervulina. The embryo-adapted strain of E. mivati which reproduced relatively poorly, was only mildly pathogenic but still possessed antigens capable of inducing protective immunity against challenge with a pathogenic strain of E. mivati.

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