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Journal of Clinical Microbiology, January 2002, p. 96-100, Vol. 40, No. 1
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.1.96-100.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Multiplex LightCycler PCR Assay for Detection and Differentiation of Bordetella pertussis and Bordetella parapertussis in Nasopharyngeal Specimens

Lynne M. Sloan,1 Marlene K. Hopkins,1 P. Shawn Mitchell,1 Emily A. Vetter,1 Jon E. Rosenblatt,1,2 W. Scott Harmsen,3 Franklin R. Cockerill,1,1,2 and Robin Patel1,2*

Division of Clinical Microbiology,1 Division of Infectious Diseases,2 Section of Biostatistics, Mayo Clinic, Rochester, Minnesota3

Received 18 July 2001/ Returned for modification 23 September 2001/ Accepted 21 October 2001

A rapid real-time multiplex PCR assay for detecting and differentiating Bordetella pertussis and Bordetella parapertussis in nasopharyngeal swabs was developed. This assay (LC-PCR-IS) targets the insertion sequences IS481 and IS1001 of B. pertussis and B. parapertussis, respectively, and is performed using the LightCycler (Roche Molecular Biochemicals, Indianapolis, Ind.). The analytical sensitivity is less than one organism per reaction. Results for Bordetella culture and/or direct fluorescent antibody testing and a second LightCycler PCR assay (target, pertussis toxin gene) were compared to results of the LC-PCR-IS assay for 111 nasopharyngeal swabs submitted for pertussis testing. Of the specimens, 12 were positive (9 B. pertussis and 3 B. parapertussis) and 68 specimens were negative by all methods. Three other specimens were positive for B. pertussis by at least two of the methods (including the LC-PCR-IS assay), and another 28 specimens were positive for B. pertussis by the LC-PCR-IS assay only. No specimens were negative by the LC-PCR-IS assay and positive by the other methods. A conventional PCR method (target, IS481) was also compared to the LC-PCR-IS assay for a different group of nasopharyngeal swab specimens (n = 96): 44 specimens were positive and 41 specimens were negative for B. pertussis with both PCR methods. Nine specimens were positive for B. pertussis by the LC-PCR-IS assay and negative by the conventional PCR assay, and two specimens were positive for B. pertussis by the conventional PCR assay and negative by the LC-PCR-IS assay. Positivity of the two assays was not significantly different (P = 0.0654). The insertion sequence IS481 is also present in Bordetella holmesii; specimens containing B. holmesii may yield false-positive results. The LC-PCR-IS assay takes approximately 45 min to complete post-nucleic acid extraction, compared to 24 h for the conventional PCR assay previously used in our laboratory. The LC-PCR-IS assay is easier to perform than the conventional PCR assay, and the closed system decreases the chance of contamination. All of these characteristics represent a significant improvement in the detection of B. pertussis and B. parapertussis in nasopharyngeal specimens.

* Corresponding author. Mailing address: Division of Infectious Diseases, Mayo Clinic, 200 First St. S.W., Rochester, MN 55905. Phone: (507) 255-6482. Fax: (507) 255-7767. E-mail: patel.robin{at}mayo.edu.

Journal of Clinical Microbiology, January 2002, p. 96-100, Vol. 40, No. 1
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.1.96-100.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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