Abstract
In order to improve detection of Bordetella pertussis in nasopharyngeal aspirates (NPAs) in our laboratory, a PCR-based assay was optimized, and a study was designed (i) to compare results obtained by PCR to those obtained by culture and (ii) to evaluate a novel microtiter plate-based DNA hybridization assay (PCR-plate) by comparing it to agarose gel electrophoresis (PCR-gel) for detection of the PCR product. DNA for the PCR was extracted with a guanidine thiocyanate buffer and used in a PCR mixture containing primers directed against a reiterated gene sequence in B. pertussis (Q. He, J. Mertsola, H. Soini, M. Skurnik, O. Ruuskanen, and M. K. Viljanen, J. Clin, Microbiol. 31:642-645, 1993). Of 96 NPAs submitted from a targeted study group, 23 were positive by culture, 27 were positive by PCR-gel, and 31 were positive by PCR-plate. All culture-positive specimens were also positive by PCR. Of nine patients with culture-negative-PCR-positive results, six had discharge diagnoses of pertussis. Thus, PCR with plate-based product detection is a sensitive method for the laboratory detection of B. pertussis in NPAs. Additional advantages of the plate assay include rapidity, objectivity in reading results, specificity, and the capability of being adapted to a high-volume, automated system.
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Selected References
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