Yantis D, Moeller R, Braun R, Gardiner C H, Aguirre A, Dubey J P
Armed Forces Institute of Pathology, Washington, DC 20306-6000, USA.
J Parasitol. 2003 Dec;89(6):1258-60. doi: 10.1645/GE-3265RN.
A Hawaiian monk seal (Monachus schauinslandi) died in captivity at the National Marine Fisheries Service, Kewalo Basin Facility in Honolulu, Hawaii. The animal was icteric, and the liver was friable. Microscopic lesions were detected in the colon and liver. Colonic lesions included multifocal, necrohemorrhagic colitis associated with gram-negative bacilli. The liver lesions included random hepatic necrosis and cholestasis. Asexual stages of a Sarcocystis canis-like apicomplexan were detected in hepatocytes. The parasite divided by endopolygeny. Merozoites occasionally formed rosettes around a central residual body. Ultrastructurally, merozoites lacked rhoptries. This is the first report of S. canis infection in M. schauinslandi, which is an endangered pinniped in U.S. waters.
一只夏威夷僧海豹（Monachus schauinslandi）在夏威夷檀香山基瓦洛湾设施的国家海洋渔业局圈养环境中死亡。该动物出现黄疸，肝脏质地脆。在结肠和肝脏中检测到微观病变。结肠病变包括与革兰氏阴性杆菌相关的多灶性坏死出血性结肠炎。肝脏病变包括散在性肝坏死和胆汁淤积。在肝细胞中检测到一种犬肉孢子虫样顶复门原虫的无性阶段。该寄生虫通过内多殖进行分裂。裂殖子偶尔在中央残余体周围形成玫瑰花结。在超微结构上，裂殖子缺乏棒状体。这是犬肉孢子虫感染夏威夷僧海豹的首次报告，夏威夷僧海豹是美国水域的一种濒危鳍足类动物。
