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A rapid diagnostic assay for differentiating avian infectious bronchitis virus (IBV) isolates was developed. The basis of the assay is the cleavage of target RNA by RNase H mediated by sequence-specific chimeric oligonucleotides followed by sample to residual ratio quantitation (SRRQ) using RRT-PCR. Four serotype-specific chimeric oligonucleotides were designed, one each for the Massachusetts, Connecticut,...
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