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Journal of Clinical Microbiology, December 2003, p. 5419-5428, Vol. 41, No. 12
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.12.5419-5428.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Molecular Parameters for Precise Diagnosis of Asymptomatic Epstein-Barr Virus Reactivation in Healthy Carriers

Susanne Maurmann,1 Lutz Fricke,1 Hans-Joachim Wagner,2 Peter Schlenke,3 Holger Hennig,3 Jürgen Steinhoff,1 and Wolfram J. Jabs1*

Department of Medicine I,1 Department of Pediatrics,2 Institute of Immunology and Transfusion Medicine, University of Lübeck School of Medicine, Lübeck, Germany3

Received 21 February 2003/ Returned for modification 25 April 2003/ Accepted 26 August 2003

Asymptomatic Epstein-Barr virus (EBV) reactivations periodically occur in oral mucosa-associated lymphoid tissues. Until now, EBV reactivation has been diagnosed by serologic profiles that suggest virus replication. Serologic responses, however, are delayed and do not necessarily indicate ongoing replicative activity. The aim of the present study was to establish in healthy carriers parameters for a molecular diagnosis of reactivated EBV infection. Recent studies emphasized the association of an increase in peripheral-B-cell viral load with replicative activity at remote sites. Therefore, real-time PCR was used to quantitate EBV genomes in the peripheral blood mononuclear cells (PBMC) (viral load) and plasma samples (viremia) of 22 healthy EBV-seropositive blood donors over a period of 15 months. Furthermore, transcription of the immediate-early gene encoding BZLF1 was investigated in the PBMC of all volunteers. Serology suggested reactivation in nine donors, of whom all but one showed at least once a significant increase in viral load. Another five individuals also exhibited significant changes in viral load but no serologic response. Of the 13 volunteers with significant increases in viral load, 6 had a period of viremia accompanying the rise in viral load. A stable viral load without viremia and negative serology was seen in eight adults. BZLF1 mRNA was undetectable throughout. We conclude that for healthy subjects serology underestimates the frequency of asymptomatic EBV reactivations. Prospective examination of peripheral viral load and viremia is suitable for the exact diagnosis of EBV reactivation, which might be of advantage for immunocompromised patients in whom EBV reactivations are considerably harmful.

* Corresponding author. Mailing address: Department of Medicine I, Division of Nephrology University of Lübeck School of Medicine, Ratzeburger Allee 160, 23538 Lübeck, Germany. Phone: 49-451-500 6405. Fax: 49-451-500 6334. E-mail: wjabs{at}gmx.de.

Journal of Clinical Microbiology, December 2003, p. 5419-5428, Vol. 41, No. 12
0095-1137/03/$08.00+0     DOI: 10.1128/JCM.41.12.5419-5428.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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