eggs of opisthorchis viverrini or southeast asian liver fluke in stool

400x analyze analyzing asian bile biliary cancer cestode cholangiocarcinoma diarrhea disease duct egg eggs exam experiment fecal feces fish fluke helminthology helminths infection laboratory liver magnification medical micro microbiology microscope microscopy nematode opisthorchis organism original parasite parasitic patient pinworm protozoa research roundworm science scientific southeast stool tapeworm technology test viverrini whipworm