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Determination of viral copy number (mean ± SE.; n = 8 for all groups except 24 h [n = 10]) in serum of LDV-inoculated Swiss Webster mice at 24 h and 2,4,8, and 12 wk after inoculation by quantitative RT-PCR assay. Viral copy number was significantly (*, P < 0.05; one-way ANOVA, Student–Newman–Keuls) different at each time point.
