We document the causes and pathological findings in 50 cases of equine pneumonia and pleuritis in Southern Brazil. Suppurative (17/50), pyogranulomatous (14/50), aspiration (5/50), mycotic (4/50), bronchointerstitial (3/50), embolic (3/50) and eosinophilic granulomatous pneumonia (1/50) and pleuritis (3/50) were the main conditions identified. Streptococcus spp. were identified in 11 cases of suppurative pneumonia. Suppurative pneumonia was further divided into acute (8/17), subacute (6/17) and chronic (3/17) based on the morphological pattern of lesions. Rhodococcus equi was identified in all cases of pyogranulomatous pneumonia and exclusively affected young foals.

我们记录了巴西南部50例马肺炎和胸膜炎的病因和病理发现。化脓性（17/50），脓性肉芽肿（14/50），抽吸（5/50），霉菌性（4/50），支气管间质（3/50），栓塞（3/50）和嗜酸性肉芽肿性肺炎（1/50）和胸膜炎（3/50）是确定的主要疾病。链球菌属。在11例化脓性肺炎中被发现。根据病变的形态，化脓性肺炎又分为急性（8/17），亚急性（6/17）和慢性（3/17）。在所有脓性肉芽肿性肺炎病例中均鉴定出马红球菌，并且仅感染了小马驹。