Cardiac histopathology results of PMCV infected and control groups. The proportions of histopathology scores in atrium (A), epicard (E) and spongious (S) were plotted as percentage bars. The bars represent the results of the 15 sampled fish per group and time point. The histopathology scores are shown as colours from green (score 0) to red (score 3), grey indicates missing tissue. Asterisks in the middle row represents the level of significance between groups (*/** = p < 0.05/0.01), according to two-sided t- tests. The row in the middle represents the difference between the two infected groups and the two control groups.