Abdominal pain for 4 weeks accompanied with emesia and diarrhea--To request etiological factor and treatment?

Interesting case, but perhaps this would be more appropriate for posting in the infectious disease section. Your description of a gastroenteritis picture and stool cultures showing a parasite (protozoan?) seems to indicate this. A few of your terms are foreign to me (rectum "dropsy" and "anabrosis"). Also your description of a diffuse inflammation and pleurisy is also unusual and a very systemic manifestation of this disease. You might consider tapping these effusions and/or laparoscopy?