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Clinical Microbiology Reviews, July 1998, p. 533-554, Vol. 11, No. 3
0893-8512/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Quantitation of Cytomegalovirus: Methodologic Aspects and Clinical Applications

Michael Boeckh1,* and Guy Boivin2

Fred Hutchinson Cancer Research Center, Seattle, Washington,1 and Centre Hospitalier de l'Université Laval, Sainte-Foy, Quebec, Canada2

Cytomegalovirus (CMV) is an important pathogen in transplant recipients and human immunodeficiency virus (HIV)-infected individuals. Major progress has been made in developing quantitative detection methods for CMV in recent years. Due to their high sensitivity, these assays can detect CMV early, and quantitation may be useful in predicting the patient's risk for disease and in monitoring the effect of antiviral therapy. This review discusses methodological aspects of currently used quantitative assays for CMV (i.e., viral culture techniques, antigen detection assays, DNA detection assays including PCR, branched-DNA assay, and the DNA hybrid capture assay) and addresses the correlation of systemic and site-specific CMV load and CMV disease in different populations of immunosuppressed patients as well as the response to antiviral treatment. To date, direct antigen detection and molecular techniques have largely replaced traditional culture-based techniques for CMV quantitation. In general, a high systemic CMV load is correlated with CMV disease. This correlation is strong in the HIV-infected population and in solid-organ transplant recipients but less clear in allogeneic marrow transplant recipients. Measuring the viral load at specific anatomic sites may be an alternative way to assess disease activity in situations where the systemic viral load correlates poorly with disease activity. A reduction of the systemic CMV load also correlates with a response to antiviral treatment, but more research is needed to evaluate the role of viral load as a surrogate marker for drug resistance. Due to the widespread use of quantitative CMV detection techniques to direct and monitor antiviral treatment, there is a great need for an assessment of the reproducibility of test results and better standardization of the assays.

* Corresponding author. Mailing address: Program in Infectious Diseases, Fred Hutchinson Cancer Research Center, 1100 Fairview Ave. North, Seattle, WA 98109. Phone: (206) 667-6702. Fax: (206) 667-4411. E-mail: mboeckh{at}fhcrc.org.

Clinical Microbiology Reviews, July 1998, p. 533-554, Vol. 11, No. 3
0893-8512/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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Antimicrob. Agents Chemother. Clin. Vaccine Immunol.
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Copyright © 1998 by the American Society for Microbiology. All rights reserved.