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Journal of Clinical Microbiology, August 1999, p. 2543-2547, Vol. 37, No. 8
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Detection of Dengue Virus RNA in Patients after Primary or Secondary Dengue Infection by Using the TaqMan Automated Amplification System

Thomas Laue, Petra Emmerich, and Herbert Schmitz*

Department of Virology, Bernhard Nocht Institute for Tropical Medicine, Hamburg, Germany

Received 1 March 1999/Returned for modification 12 April 1999/Accepted 4 May 1999

In consecutive serum samples from 25 tourists with acute dengue fever, virus-specific RNA was detected by using fully automated TaqMan reverse transcriptase PCR. For this amplification technique new primers and special fluorochrome-labeled probes had to be synthesized. During amplification the increasing amount of viral DNA could simultaneously be measured in the tightly sealed tubes. Dengue virus RNA was found in almost all patients (17 of 18), if the samples had been taken soon after the onset of symptoms and before anti-dengue virus antibody had been produced. RNA was detectable in only one of five persons who had anti-dengue virus immunoglobulin M (IgM) antibodies but not yet IgG antibodies. In 30 late samples with both IgG and IgM antibodies viral RNA was no longer demonstrable. In two early samples from two frequent travelers obtained 1 and 2 days after the onset of symptoms significant IgG antibody titers were present but there were no anti-dengue virus IgM antibodies. In these samples a viral load of >5 × 106 dengue virus RNA copies (dengue types 1 and 2) was detectable. These findings of a high viral load in the presence of anti-dengue virus IgG antibody are suggestive of a secondary dengue virus infection. In the 20 tourists (17 plus 1 plus 2) in whom viral RNA was found, the dengue virus serotype could be related to the area where the infection had taken place. Most of our patients came from southeast Asia and most frequently had dengue virus type 1 infections (8 of 20).

* Corresponding author. Mailing address: Department of Virology, Bernhard Nocht Institute for Tropical Medicine, Bernhard-Nocht. Str. 74, D-20359 Hamburg, Germany. Phone: 49-40-42818-460. Fax: 49-40-42818-378. E-mail: schmitz{at}bni.uni-hamburg.de.

Journal of Clinical Microbiology, August 1999, p. 2543-2547, Vol. 37, No. 8
0095-1137/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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Antimicrob. Agents Chemother. Clin. Microbiol. Rev.
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Copyright © 1999 by the American Society for Microbiology. All rights reserved.