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Journal of Clinical Microbiology, January 2003, p. 149-154, Vol. 41, No. 1
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.1.149-154.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Simultaneous Detection, Subgrouping, and Quantitation of Respiratory Syncytial Virus A and B by Real-Time PCR

Aizhong Hu,1 Melissa Colella,2 John S. Tam,3 Ruth Rappaport,1 and Sheau-Mei Cheng1*

Clinical Virology Department, Applied Immunology and Microbiology Division, Wyeth Vaccines, Pearl River, New York,1 Wellesley College, Wellesley, Massachusetts,2 Department of Microbiology, Chinese University of Hong Kong, Hong Kong3

Received 24 June 2002/ Returned for modification 18 August 2002/ Accepted 19 October 2002

Timely diagnosis of respiratory syncytial virus (RSV) infection is critical for appropriate treatment of lower respiratory infection in young children. To facilitate diagnosis, we developed a rapid, specific, and sensitive TaqMan PCR method for detection of RSV A and RSV B. Two sets of primer-probe pairs were selected from the nucleotide sequences encoding the nucleocapsid protein—one targeting RSV A and the other targeting RSV B. The specificity of the TaqMan reverse transcription-PCR assay was evaluated by testing each primer-probe pair against various viruses derived from laboratory virus stocks, as well as clinical respiratory specimens. Fluorescent signals were observed only in the presence of RSV A and/or RSV B. The sensitivity of our quantitative PCR assay was determined on the basis of PFU and virus particle counts. The resulting assay sensitivity was found to be 0.023 PFU, or two copies of viral RNA, for RSV A and 0.018 PFU, or nine copies of viral RNA, for RSV B. This quantitative TaqMan PCR assay was utilized to diagnose 175 nasopharyngeal aspirates obtained from children in Hong Kong with respiratory symptoms during the winter of 2000 and 2001. Among these specimens, TaqMan PCR detected 36 RSV-positive samples, 10 of which were identified as RSV A and 26 of which were identified as RSV B, whereas culture confirmation identified 21 RSV-positive specimens and immunofluorescence identified 32 RSV-positive specimens, all of which were among those identified by PCR. The results confirmed the accuracy of our TaqMan PCR assay and demonstrated its improved sensitivity versus classical methods.

* Corresponding author. Mailing address: Wyeth Vaccines, Bldg. 180 Rm. 216, 401 N. Middletown Rd., Pearl River, NY 10965. Phone: (845) 602-5115. Fax: (845) 602-5296. E-mail: chengsm{at}wyeth.com.

Journal of Clinical Microbiology, January 2003, p. 149-154, Vol. 41, No. 1
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.1.149-154.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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