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The averaged diarrhea scores of each group during the experimental period. The piglets in groups 1 to 4 were inoculated with 103 to 106 TCID50 of 5-17-O (solid and gray lines), respectively. The piglets in groups 5 to 8 were inoculated with 104 to 107 TCID50 of 5-17-V (dotted and black lines), respectively. Group 9 was the negative control. The diarrhea was scored as follows: 0 = solid; 1 = soft to pasty; 2 = semi-liquid; 3 = complete liquid.
