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Testing results for 3 cytomegalovirus (CMV) virus stocks and the World Health Organization international standard using 3 paired quantitative polymerase chain reaction (qPCR) assays with long and short amplicons. Six 10-fold dilutions of Towne viral stock were tested. No significant difference was found in CMV DNA measurement among all assays (log10 copies per milliliter; t test, P > .80). Abbreviations: CMV, cytomegalovirus; IS, international standard; WHO, World Health Organization.
