Effects of three TCM compounds on lung index of mice infected with influenza virus. The body weight of mice was monitored every day for 17 days. The mice were sacrifice on day 17, and the total lung were completely removed and weighed. Lung index = day 17 lung weight/day 17 body weight × 100%. Statistical analysis was performed by one-way ANOVA. P* = P value for Bonferroni correction. *P < 0.05, **P < 0.01, ***P < 0.001.