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Characterisation of bodyweight lost and lung index post influenza virus A (H7N9) infection in mice. Inbred BALB/c, C57BL/6 and outbred ICR mice were intranasally infected (i.n.) with 4×105 TCID50 influenza A virus (A/Shanghai/4664T/2013(H7N9)). The bodyweight loss was monitored. Lungs were collected at day 3 d.p.i or 7 d.p.i.. The results of lung index are expressed as the mean±s.d., *P<0.05, **P<0.01, n=3. (A) Bodyweight change. (B) Lung index.
