Histological scores in the CNS following JEV-infection of pigs. At necropsy brains and the spinal cord were sampled, fixed and processed routinely for H and E staining. Data are shown for each day (A–D) separately. Lesions were scored semi-quantitatively from 0 to 4 (0=no lesions, 1=minimal lesions, 2=mild lesions, 3=moderate lesions, 4=severe lesions). Scores of three healthy control piglets (CTRL) were 0. E Sum of all CNS tissues scores with each symbol representing an individual pig.