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Histopathological grading of liver pathology from MNV-infected mice. Liver histopathology was scored (see Table S1 for scoring system) after (a) acute (day 7 p.i.) and (b) chronic (day 54 p.i.) infection (108 RNA copies by oral gavage). Individual mouse scores and group medians are shown. Statistical analysis used a Mann–Whitney test; *P<0.01 and **P<0.001 comparing an infected group to the mock-infected group.
