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Journal of Clinical Microbiology, November 2002, p. 4251-4255, Vol. 40, No. 11
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.11.4251-4255.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Improved Monitoring of Cytomegalovirus Infection after Allogeneic Hematopoietic Stem Cell Transplantation by an Ultrasensitive Plasma DNA PCR Assay

Laurent Kaiser,1* Luc Perrin,1 Bernard Chapuis,2 Karine Hadaya,1 Lenka Kolarova,1 Christelle Deffernez,1 Saadia Huguet,2 Claudine Helg,3 and Werner Wunderli1

Division of Infectious Diseases,1 Division of Hematology,2 Division of Oncology, University Hospital of Geneva, Geneva, Switzerland3

Received 20 March 2002/ Returned for modification 20 July 2002/ Accepted 17 August 2002

Cytomegalovirus (CMV) DNA amplification assays in plasma have shown limited sensitivity compared to the detection of pp65 antigen in leukocytes. Our goal was to increase the sensitivity of a commercial CMV DNA PCR quantitative assay. After modification, the new assay was able to reproducibly detect 20 CMV DNA copies/ml of plasma. We compared this new ultrasensitive PCR assay with the standard PCR and the pp65 test for CMV detection and quantification in 22 consecutive allogeneic hematopoietic stem cell recipients. CMV infection or reactivation was detected in 84 of 319 (26%) samples by the ultrasensitive PCR assay compared to 38 of 319 (12%) samples by the pp65 assay (P < 0.01). All samples positive by the pp65 assay were positive by the ultrasensitive PCR, and CMV episodes were detected on average 4 days earlier and 7 days later than the first and the last pp65-positive test, respectively. In addition, during CMV episodes, the ultrasensitive assay identified positive samples that were inconsistently detected by the pp65 assay. The ultrasensitive assay was also much more sensitive than the standard PCR, with 26 versus 12% of CMV DNA-positive samples (P < 0.01). This assay improved the monitoring of CMV infection or reactivation in hematopoietic allogeneic stem cell recipients.

* Corresponding author. Mailing address: Division of Infectious Diseases, Central Laboratory of Virology, University Hospital of Geneva, 24 Rue Micheli-du-Crest, 1211, Geneva 14, Switzerland. Phone: 022 37 24 992. Fax: 022 37 24 990. E-mail: laurent.kaiser{at}hcuge.ch.

Journal of Clinical Microbiology, November 2002, p. 4251-4255, Vol. 40, No. 11
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.11.4251-4255.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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