of helminths on color background. parasites in human body

abdominal animal ascariasis ascaris background body color diarrhea disease dog duodenum eat endoparasite fish food handwashing health healthy helminth helminths host human hygiene illustration infectious intestinal intestine invertebrate lumbricoides medical nature nematode nobody object pain parasite parasites parasitic pet pyrantel red roundworm sanitation science system tapeworm trichina wildlife worm