A dog presents with acute onset vomiting, hemorrhagic diarrhea and fever. On fecal examination, you find many large fluke eggs. You question the owner and discover that the dog was recently in Oregon on a boating trip. What agent is most likely causing the clinical signs in this dog?
狗出现急性呕吐，出血性腹泻和发烧的症状。 在粪便检查中，您发现许多大型虫卵。 你询问了主人并发现这条狗最近在俄勒冈州坐过船。 什么东西最有可能导致这种狗的临床症状？