FIG. 3.

Serum DHBV DNA concentrations determined by a quantitative PCR ELISA in individual vehicle-treated ducklings (A) and in ducklings treated with 1 mg of ETV/kg per day for 21 days (B). The stippled areas of the graphs indicate the treatment periods. Evaluations of statistical significance were performed by the Student t test for day-21 concentrations compared to those for vehicle-treated controls, yielding a P of <0.025.