Andrews’ Chapter 20 pgs 526-547. JoAnne M. LaRow, D.O. December 9, 2003. Phylum Protozoa. One-celled organisms Divided into classes according to nature of locomotion Class Sarcodina move by temporary projections of cytoplasm (pseudopods) Class Mastigophora by means of one or more flagella
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JoAnne M. LaRow, D.O.
December 9, 2003
All are radial marine animals
Flatworms: two classes:
Cestodes: segmented, ribbon-shaped flatworms that inhabit intestinal tract as adults and involve subcutaneous tissue, heart, muscle, eye in larval form
Encased in a sac eventually becoming calcified
Eating raw flesh from second intermediate host, most commonly freshwater fish, in form of sashimi & ceviche allows humans to become definitive host
One report of eating raw snake flesh
As the larval cyst in the flesh is digested, larva becomes motile and penetrates gastric mucosa, usually within 24-48 hrs of ingestion
Symptoms then occur as migration of parasite continues
Surgical removal is TOC if parasite can be located
This can be combined with albendazole 400 mg daily or BID for 21 daysGnathostomiasis