NAVLE（北美执业兽医考题）Day 643

Q1:Suzie, a 6-month old female spayed domestic short hair was recently adopted from the humane society. She has had watery diarrhea since adoption. Her fecal float and Giardia ELISA tests were negative. She was treated with metronidazole with no clinical improvement. You soak a cotton tip swab with saline and swab the rectum. You see elongated motile oval shaped protozoan organisms that do not look like Giardia lamblia. What organism might this be and what is the appropriate therapy?Suzie，一只6个月大的雌性绝育短毛猫，最近被慈善组织领养。 自领养以来，她出现了水样腹泻。 她的粪便漂浮和贾第虫ELISA试验均为阴性。 给她进行了甲硝唑治疗，但没有改善。 用生理盐水浸湿的棉签擦拭直肠进行抹片。 看到一个细长的运动的椭圆形原生动物，但看起来不像贾第虫。 这可能是什么生物体，适当的疗法是什么？