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Polygalasaponin F treatment protected mice from influenza challenge. BALB/c mice(n = 10) were treated for 2 h after viral challenge and 6 days after infection and monitored daily for signs and symptoms, body weight loss, and survival for 15 consecutive days. a Body weight; b survival rate; c survival time. Values are mean ± SD. Asterisks denote the significance levels: *p < 0.05; **p < 0.01; *** p < 0.001, compared with IAV-C group
