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Journal of Clinical Microbiology, February 2004, p. 841-843, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.841-843.2004
Copyright © 2004, American Society of Microbiology. All Rights Reserved.

Use of an Internal Positive Control in a Multiplex Reverse Transcription-PCR To Detect West Nile Virus RNA in Mosquito Pools

Diane L. Eisler,* Alan McNabb, Danielle R. Jorgensen, and Judith L. Isaac-Renton

Division of Laboratory Services, British Columbia Centre for Disease Control, Vancouver, British Columbia, Canada

Received 10 July 2003/ Returned for modification 5 October 2003/ Accepted 4 November 2003

We report on the use of West Nile virus Armored RNA as an internal positive control (IPC) for the extraction and reverse transcription-PCR (RT-PCR) of RNA extracted from field-collected mosquitoes and on a multiplex real-time Taqman RT-PCR to simultaneously detect the 3' noncoding region of West Nile virus and the West Nile virus NS5-2 region comprising the IPC. Mosquito pools from the province of British Columbia, Canada (n = 635), were tested in duplicate and found to be negative for West Nile virus and positive for the IPC. Known West Nile virus-positive supernatants from mosquito pools from the provinces of Alberta and Manitoba were tested in duplicate and found to be positive for both regions of the West Nile virus genome. The mean cycle threshold (Ct) value for the IPC in batch extraction controls ± 2 standard deviations was found to be 36.43 ± 1.78 cycles. IPCs of 98.4% (624) of West Nile virus-negative pools fell within this range, indicating the reproducibility of RNA extraction and RT-PCR for pools varying in mosquito genus and number. A comparison of mosquito pool genera revealed no significant genus effect on the Ct value of the IPC. The incorporation of West Nile virus Armored RNA as an IPC allows monitoring of RNA extraction and RT-PCR and detection of false-negative results due to failures in these processes or to PCR inhibition, respectively.

* Corresponding author. Mailing address: Molecular Services Laboratory, Division of Laboratory Services, British Columbia Centre for Disease Control, 655 West 12th Ave., Vancouver, British Columbia, Canada V5Z 4R4. Phone: (604) 660-6046. Fax: (604) 660-6073. E-mail: diane.eisler{at}bccdc.ca.

Journal of Clinical Microbiology, February 2004, p. 841-843, Vol. 42, No. 2
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.2.841-843.2004
Copyright © 2004, American Society of Microbiology. All Rights Reserved.



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