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Ch. 29 vocabulary

Protozoal and Multicellular Parasite Diseases of GI Tract

Amoebiasis amoebic disease--motility via pseudopods--transmission fecally contaminated water or food--ulcers, bloody stools, little diarrhea--can invade bloodstream and travel to organs like lung or liver--higher in areas of poor sanitation and male homosexuals
Balantidiases motility by cilia, large 70x100 microns--single-celled protozoan--balantidium coli--only human disease caused by ciliates--undercooked food--cysts pass through stomach and trophozoites cause ulceration in intestines--nausea, diarrhea, weight loss
Cryptosporidiosis protozoan--watery diarrhea, nonmotile, small oocysts infectious form (10 microns), common in dogs, cattle, and pigs--Cryptosporidium parvum--fecal-oral transmission and day care centers
Definitive host fluke--adult (sexually mature) form
Flukes flat, leaf-shaped, single-celled parasites--complex life cycles--egg stages and larval forms--attach to hosts by suckers--2 hosts as part of life cycle
Giardiasis protazoan--motility via flagella--most common infectious in the US--Giardia lamblia--contaminate water--cysts develop into flagellated trophozoites in intestine attach to intestinal villi--smiley faces--cramps, nausea, diarrhea, odiferous flatulence
Helminths flatworms--platyhelminths--roundworms---aschelminths or nematodes--most produce eggs or larvae that pass out of host's body--small single-celled flukes to tapeworms may be 25ft--can cause disease
Hookworm parasite--roundworm--larvae have hooks that attach to bare feet--Ancylostoma duodenale and Necator americanus--attach to intestines cause anemia by sucking blood--attach to bare feet, penetrate into bloodstream, go to lungs, coughed up and swallowed
Intermediate host larval form of fluke grows here
Miracidia schistosomiasis eggs hatch into motile forms--swim up till find propper type of snail to be entermidiate host
Pinworm parasite--roundworm, body mascular (like common garden worms)--Enterobium vermicularis--most prevelent helminth in children--adult females living in colon migrate to anus and lay eggs in perianal folds-puritis develops--itching and diarrhea--tape removes
Proglottid each segment of a tapeworm--essentiallly a uterus--new ones form behind scolex and produce eggs--further from head and large ones break away, spread thousands of eggs
schistosomiasis parasite--motility via powerful tails called cercaria--each fluke infects/develops in fluke-specific snail before infecting humans--human definitive host--schistosoma mansoni, S. japonicum, S haematobium
Scolex the head of a scolex--has hook or sucker for attachment to infected tissue--many individual segments attached to it
Swimmer's itch cercaria of other species whose normal definitive host is bird or other animal infect humans stay at the site of infection causes dermatitis
Trichinosis parasite--roundworm--forms cysts in brain/muscles of host--painful and damaging--Trichinella spiralis--nausea, avd pain, vomiting, constipation
Whipworm parasite--whip-like structure--muscular roundworm--Trichuris trichiura--long slender shape--attaches to junction of small and large intestines--damages surrounding tissue by whipping movements
Created by: heatherlvn