Two cases of focal mucopurulent placentitis (FMP) associated with Stenotrophomonas maltophilia are reported herein. The first patient, a 12-year-old Quarter Horse mare, aborted at 287 days of gestation and the fetus and placenta were submitted for post-mortem examination. Histopathological findings included chronic exudative allantochorionitis and fetal multifocal suppurative hepatitis. The second patient, a 10-year-old Thoroughbred mare, prematurely delivered a live foal at 293 days of gestation. Chronic exudative allantochorionitis and perifunisitis were diagnosed. The foal was severely compromised and was euthanised. On post-mortem examination, pneumonia, myocardial and hepatic necrosis, and sepsis were diagnosed. The fetal membranes of both mares had a thick adherent mass of exudate overlaying the chorionic surface. The lesions were well demarcated, and the underlining chorion was avillous, pale and thickened. Stenotrophomonas maltophilia was isolated from the exudate of both mares and from the lungs and stomach of the fetus from the first patient. To the authors’ knowledge, this is the first clinical description of FMP associated with S. maltophilia in the USA. The aetiopathogenesis of placentitis induced by this micro-organism and its relevance as an emerging pathogen in equine reproduction remains to be further elucidated.

中文翻译：

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与嗜麦芽窄食单胞菌相关的马局灶性粘液脓性胎盘炎

嗜麦芽窄食单胞菌相关的局灶性粘液脓性胎盘炎（FMP）2例在此报道。第一位患者是一头 12 岁的夸特马母马，在妊娠 287 天时流产，胎儿和胎盘被送去进行尸检。组织病理学发现包括慢性渗出性尿囊绒毛膜炎和胎儿多灶性化脓性肝炎。第二名患者是一匹 10 岁的纯种母马，在妊娠 293 天时过早分娩了一只活马驹。诊断为慢性渗出性尿囊绒毛膜炎和周炎。小马驹严重受损并被安乐死。尸检诊断为肺炎、心肌和肝脏坏死以及败血症。两匹母马的胎膜都有一层粘稠的渗出液覆盖在绒毛膜表面。病灶界限清楚，下衬绒毛膜呈绒毛状、苍白和增厚。嗜麦芽窄食单胞菌是从第一名患者的母马和胎儿的肺和胃的渗出液中分离出来的。据作者所知，这是美国首次对与嗜麦芽窄食单胞菌相关的 FMP 进行临床描述。由这种微生物引起的胎盘炎的发病机制及其作为马繁殖中新兴病原体的相关性仍有待进一步阐明。