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Journal of Clinical Microbiology, December 2001, p. 4506-4513, Vol. 39, No. 12
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.12.4506-4513.2001

Nucleic Acid Sequence-Based Amplification Assays for Rapid Detection of West Nile and St. Louis Encephalitis Viruses

Robert S. Lanciotti* and Amy J. Kerst

Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Public Health Service, U.S. Department of Health and Human Services, Fort Collins, Colorado

Received 20 July 2001/Returned for modification 17 August 2001/Accepted 5 September 2001

The development and application of nucleic acid sequence-based amplification (NASBA) assays for the detection of West Nile (WN) and St. Louis encephalitis (SLE) viruses are reported. Two unique detection formats were developed for the NASBA assays: a postamplification detection step with a virus-specific internal capture probe and electrochemiluminescence (NASBA-ECL assay) and a real-time assay with 6-carboxyfluorescein-labeled virus-specific molecular beacon probes (NASBA-beacon assay). The sensitivities and specificities of these NASBA assays were compared to those of a newly described standard reverse transcription (RT)-PCR and TaqMan assays for SLE virus and to a previously published TaqMan assay for WN virus. The NASBA assays demonstrated exceptional sensitivities and specificities compared to those of virus isolation, the TaqMan assays, and standard RT-PCR, with the NASBA-beacon assay yielding results in less than 1 h. These assays should be of utility in the diagnostic laboratory to complement existing diagnostic testing methodologies and as a tool in conducting flavivirus surveillance in the United States.

* Corresponding author. Mailing address: Division of Vector-Borne Infectious Diseases, National Center for Infectious Diseases, CDC, Rampart Rd., Fort Collins, CO 80521. Phone: (970) 221-6440. Fax: (970) 221-6476. E-mail: rsl2{at}cdc.gov.

Journal of Clinical Microbiology, December 2001, p. 4506-4513, Vol. 39, No. 12
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.12.4506-4513.2001


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