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Gross lung lesion scores and virus load in lungs at 15 DPC. (A) Gross lung lesion examination. (B) Gross lung lesion scores were calculated based on the affected percentage of lung area, shown as mean ± standard error (error bars). (C) The virus load in lungs were measured at 15 DPC. Data were shown as mean ± standard error (error bars) (*p < 0.05; **p < 0.01; ***p < 0.001). NS, Not Statistically Significant.
