Discrimination of eight chicken Eimeria species using the two-step polymerase chain reaction.

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Abstract
A method was developed for the discrimination of 8 Eimeria species of chickens, i.e., E. acervulina, E. brunetti, E. mitis, E. maxima, E. necatrix, E. praecox, E. tenella, and E. hagani using the 2-step polymerase chain reaction (PCR). In the first PCR, the small subunit ribosomal RNA (srRNA) gene was amplified from the parasite genome using conserved sequences for the Apicomplexa srRNA gene as the primers. The srRNA gene amplified from the parasite genome was discriminated in the second step by random-amplified polymorphic DNA (RAPD) PCR using 10 arbitrary primers. Each arbitrary primer produced species-specific RAPD patterns that provided a simple method for species identification from the srRNA genes of the 8 Eimeria species. This method should be useful for discrimination of the parasite species for diagnosis or epidemiological surveys of chicken coccidiosis.

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