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Detection of Eimeria acervulina using the polymerase chain reaction.

A polymerase chain reaction (PCR)-based assay was developed for the detection of Eimeria acervulina. Primers were designed to amplify a fragment of the EASZ240/160 sporozoite antigen gene. The PCR assay detected as few as 10 E. acervulina oocysts in a mixed population containing a total of 10(6) oocysts. No nonspecific reaction was observed with any other species of avian Eimeria known to occur in Australia. PCR products from genomic DNA were 237 bp larger than predicted from previously reported cDNA sequences. Sequencing of the product revealed the presence of a probable intron. This work demonstrates the potential of PCR-based assays for identification and detection of avian Eimeria. Potential uses include identification of minor species present in mixed infections and quality control in the production of live vaccines.