the histological categories included normal lungs ( control ; 17 horses ) , chronic small airway disease with mild ( 23 horses ) , moderate ( 13 horses ) and severe lesions ( 25 horses ) , interstitial pneumonia ( 13 horses ) , pulmonary eosinophilic infiltration ( 13 horses ) and pulmonary haemorrhage ( 5 horses ) .
C0024109
lungs
C0206061
interstitial pneumonia