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Journal of Clinical Microbiology, Jul 1997, 1819-1821, Vol 35, No. 7
Copyright © 1997 by the American Society for Microbiology. All rights reserved.

Comparison of culture and the antigenemia assay for detection of cytomegalovirus in blood specimens submitted to a reference laboratory

BG Brumback, SN Bolejack, MV Morris, C Mohla and TE Shutzbank
Virology Department, American Medical Laboratories, Inc., Chantilly, Virginia, USA.

We compared the antigenemia assay (AA) with tandem shell vial cultures (SVCs) and tube cultures (TCs) for detection of cytomegalovirus (CMV) in 343 blood specimens. For 249 specimens, the AA was performed in duplicate with two different commercially available monoclonal antibody reagents (Biotest Diagnostic Corporation and Argene Biosoft). Specimens considered true positives were positive in either culture system or both AAs. Only specimens which were negative in both cultures and positive in a single AA were tested retrospectively with a CMV PCR assay. CMV recovery rates were also calculated to determine if increased specimen age resulted in decreased positivity. CMV recovery rates for the AA and the combination of both cultures were 20.0 and 5.0% at 3 to 18 h, 20.2 and 14.0% at 18 to 35 h, 12.5 and 7.8% at 36 to 52 h, and 18.8 and 6.3% at 64 to 75 h, respectively. The sensitivities and specificities of the Biotest AA, the Argene AA, SVC, and TC were 84.4 and 100.0, 100.0 and 99.6, 44.4 and 100.0, and 46.0 and 100.0%, respectively. The AA was significantly more sensitive than either culture method alone and was also more sensitive than the two culture methods used in tandem (the tandem culture sensitivity was 63.5%); the Argene AA identified more positives than the Biotest AA.

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