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Histopathological lung lesion scores from progressively passaged rH1N1 virus-infected pigs at 4 dpi. Microscopic lesions of the cardiac lobes (black bars) and diaphragmatic lobes (white bars) were evaluated and assigned a score of 0 to 4 based on evaluation criteria described in Materials and Methods. All values shown represent the mean score from three independent evaluations of each lung. A representative score from SD731 virus-infected lungs served as a positive control.
