the structure of pinworms. pinworm. on background

anatomy animal antique art artwork ascariasis ascarid biology black crawl diagnosis digestive disease drawing eggs engraved enterobiasis enterobiosis enterobius faecal fecal health helminth human illustration infected infection inside intestinal invasion isolated itching medical medicine nematode organism parasite parasitic picture pinworm roundworm science seatworm threadworm vector vermicularis vintage white worm