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Journal of Clinical Microbiology, December 2001, p. 4456-4461, Vol. 39, No. 12
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.12.4456-4461.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Quantitative Real-Time PCR Detection of Rift Valley Fever
Virus and Its Application to Evaluation of Antiviral
Compounds
Stephan
Garcia,1
Jean Marc
Crance,1
Agnes
Billecocq,2
Andre
Peinnequin,1
Alain
Jouan,1
Michele
Bouloy,2 and
Daniel
Garin1,*
Unité de Virologie, Centre de
Recherches du Service de Santé des Armées (CRSSA) Emile
Pardé, Grenoble,1 and Groupe
des Bunyaviridés, Institut Pasteur,
Paris,2 France
Received 6 August 2001/Returned for modification 12 September
2001/Accepted 27 September 2001
The Rift Valley fever virus (RVFV), a member of the genus
Phlebovirus (family Bunyaviridae) is an
enveloped negative-strand RNA virus with a tripartite genome. Until
2000, RVFV circulation was limited to the African continent, but the
recent deadly outbreak in the Arabian Peninsula dramatically
illustrated the need for rapid diagnostic methods, effective
treatments, and prophylaxis. A method for quantifying the small RNA
segment by a real-time detection reverse transcription (RT)-PCR using
TaqMan technology and targeting the nonstructural protein-coding region
was developed, and primers and a probe were designed. After
optimization of the amplification reaction and establishment of a
calibration curve with synthetic RNA transcribed in vitro from a
plasmid containing the gene of interest, real-time RT-PCR was assessed
with samples consisting of RVFV from infected Vero cells. The method
was found to be specific for RVFV, and it was successfully applied to
the detection of the RVFV genome in animal sera infected with RVFV as
well as to the assessment of the efficiency of various drugs (ribavirin, alpha interferon, 6-azauridine, and glycyrrhizin) for
antiviral activity. Altogether, the results indicated a strong correlation between the infectious virus titer and the amount of viral
genome assayed by real time RT-PCR. This novel method could be of great
interest for the rapid diagnosis and screening of new antiviral
compounds, as it is sensitive and time saving and does not require
manipulation of infectious material.
*
Corresponding author. Mailing address: Unité de
Virologie, CRSSA, 24 avenue des Maquis du Grésivaudan, BP
87-38702 La Tronche cedex, France. Phone: 33-476-63-68-44. Fax:
33-476-63-69-17. E-mail: Daniel.Garin{at}wanadoo.fr.
Journal of Clinical Microbiology, December 2001, p. 4456-4461, Vol. 39, No. 12
0095-1137/01/$04.00+0 DOI: 10.1128/JCM.39.12.4456-4461.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
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