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Diarrhea scores of the challenged piglets. The five-old-day piglets were inoculated orally with PDCoV CHN-SC2015 passage 12 and DMEM. Clinical signs were observed daily, and diarrhea was scored for challenged piglets as followed: 0 = normal feces,1 = soft, 2 = liquid with some solid content,3 = watery with no solid content.
