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Figure 1 Mouse cytomegalovirus (CMV) deoxyribonucleic acid (DNA) concentration in mouse salivary glands. This value (which underwent square root transformation before statistical analysis) was taken as a polymerase chain reaction (PCR)-derived index of the number of viral particles present in the tissue. The results show a dose-response curve, with highest drug level associated with highest viral load. All sham-infected mice were negative for CMV DNA. The gene targeted for PCR amplification was mouse CMV IE1 exon 4. *p = 0.05 vs. no drug treatment group.