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Distribution of interstitial lung lesions in horses according to their EIAV status. The histological scores are reported for the EIAVPOS and EIAVNEG populations. This score was used to sort the horses according to the severity of the observed lung pathology where 0 to 0.4 means no lesions, 0.5 to 1.4 mild lesions, 1.5 to 2.4 moderate lesions and > 2.4 severe lesions. N: number of horses.
