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Rectal temperature, clinical sign scores, and average daily weight gain of piglets after ZJnb16-2 challenge. (A) Rectal temperatures shown are mean ± standard error (error bars); (B) The daily scores of clinical signs; (C) Average daily weight gain (ADWG) shown are mean ± standard error (error bars). Asterisk indicates significant differences between all challenged groups and healthy control group (* p <0.05; ** p < 0.01; *** p < 0.001, ns means no significant differences).
