Figure 4. Virus load and change in body weight.

Viral titers in the respiratory tract (lungs and tracheas) were detected using a plaque assay on 5 dpc (A). On 0, 3, 6, 9, and 14 dpc, the body weight of mice was recorded, and the percent body weight change was calculated (B). Data are presented as the mean ± SD and analyzed as noted above.