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Journal of Clinical Microbiology, April 2000, p. 1404-1408, Vol. 38, No. 4
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Quantitative Analysis of Human Herpesvirus 8 Viral Load Using a Real-Time PCR Assay

Francis Lallemand,1,2 Nathalie Desire,1 Willy Rozenbaum,2 Jean-Claude Nicolas,1 and Vincent Marechal1,*

Service de Microbiologie1 and Service des Maladies Infectieuses,2 Equipe d'accueil E.A. 2391, Hôpital Rothschild, 75571 Paris Cedex 12, France

Received 25 October 1999/Returned for modification 9 December 1999/Accepted 24 January 2000

We have developed a quantitative real-time PCR (TaqMan) assay aimed at measuring the cellular human herpesvirus 8 (HHV-8) DNA load in various clinical samples. Standard curves were obtained by serial dilutions of a control plasmid containing both HHV-8 (ORF73 gene) and the cellular target (human albumin gene). The assay appeared to be very sensitive (100% detection rate for at least 10 copies per well) and specific and was easily reproducible (less than 3% intra-assay variability, 5% interassay variability). This method allowed us to quantify precisely the average HHV-8 copy number per cell in various persistently HHV-8-infected cell lines (BBG-1 cells, n = 200; BC-1 cells, n = 59; BCBL-1 cells, n = 70). A retrospective study was also conducted to assess the HHV-8 DNA load in 12 human immunodeficiency virus-infected patients with either Kaposi's sarcoma (KS; seven patients monitored over a 3-month period) or multicentric Castleman's disease (MCD; five patients). The HHV-8 DNA load ranged from 0 to 9,171 copies/106 cells in low-risk KS patients (T0, I0, S0 according to the classification of the AIDS Clinical Trials group). We also measured the viral loads in MCD patients either during symptomatic periods or during remission. The results are in agreement with previously published data, with high viral loads correlating with clinical symptoms (1.3 × 106 copies/106 cells) and low viral loads correlating with asymptomatic periods (less than 5,000 copies/106 cells).

* Corresponding author. Mailing address: Service de Microbiologie, Equipe d'accueil E.A. 2391, Hôpital Rothschild, 33, Boulevard de Picpus, 75571 Paris Cedex 12, France. Phone: 33 1 40 19 34 33. Fax: 33 1 40 19 33 35. E-mail: vmarecha{at}infobiogen.fr.

Journal of Clinical Microbiology, April 2000, p. 1404-1408, Vol. 38, No. 4
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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