teania egg human parasite in stool

animal ascariasis ascaris background biology diagnosis diagnostics disease dog education eggs fish flatworm health healthy helminth helminths host human hygiene infection intestinal intestine invertebrate isolated meat medical medicine microscope microscopic microscopy nature nematode parasite parasitic platyhelminthes proglottides roundworm saginata science scientific taenia tapeworm tissue white wildlife worm zoology teania egg stool examination