Four groups of the mice (12-13 mice/group) were intranasally inoculated with wild type or mutant viruses. Four groups of mice were sampled at day 3 and 6 post-infection, respectively. The experiment w
aSee Table 2, footnote a. bSee Table 2, footnote b. cIncrease in lifespan of the infected mice was determined using the MDD results (the MDD of a combination therapy group compared with that of a long