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Journal of Clinical Microbiology, April 2005, p. 1885-1889, Vol. 43, No. 4
0095-1137/05/$08.00+0 doi:10.1128/JCM.43.4.1885-1889.2005
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 23 September 2004/ Returned for modification 22 October 2004/ Accepted 20 December 2004
We report the development of nucleic acid sequence-based amplification (NASBA) and quantitative real-time reverse transcription (RT)-PCR assays for the detection of La Crosse (LAC) virus in field-collected vector mosquito samples and human clinical samples. The sensitivities of these assays were compared to that of a standard plaque assay in Vero cells. The NASBA and quantitative real-time RT-PCR assays demonstrated sensitivities greater than that of the standard plaque assay. The specificities of these assays were determined by testing a battery of reference strain viruses, including representative strains of LAC virus and other arthropod-borne viruses. Additionally, these assays were used to detect LAC viral RNA in mosquito pool samples and human brain tissue samples and yielded results within less than 4 h. The NASBA and quantitative real-time RT-PCR assays detect LAC viral RNA in a sensitive, specific, and rapid manner; these findings support the use of these assays in surveillance and diagnostic laboratory systems.
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