GI Parasites Flashcards
(39 cards)
A parasite that lives on the external surface of another living organism
ectoparasite
Organism in which the adult or sexually mature parasite live
Definitive host
Organism in which the parasite only lives during a period of its development
Intermediate host
Causes giardiasis from infected water
Giardia lamblia
Diagnostic: cysts in stool
Giardia lamblia
Opportunistic cryptosporidiosis from contaminated water
Cryptosporidium parvum
Obligate intracellular parasite
Cryptosporidium parvum
40% of cases have a recurrence of symptoms after initial resolution, then become chronic
Cryptosporidium parvum
Seen using a modified acid-fast stain
Cryptosporidium parvum
Person-to-person transmission because oocysts are immature
Chryptosporidium parvum
Parasitizes the small intestinal mucosa causing diarrhea for several weeks
Cyclospora cayetanensis
Most common from eating contaminated foods
Cyclospora cayetanensis
Seen using a modified acid-fast stain, larger than C parvum
Cyclospora cayetanensis
Causes a flask shaped ulcer
Entamoeba histolytica
Can cause liver abscess
Entamoeba histolytica
Frequent tenesmus and amoebic dysentery
Entamoeba histolytica
High worm burden causes eosinophilia
Ascaris lumbricoides
Progresses in the lungs and moves to intestine
Ascaris lumbricoides
Includes pulmonary systems
Ascaris lumbricoides
Prevalent in cold and temperate climates
Enterobius vermicularis
Most common helminth infection in the US
Enterobius vermicularis
Mature very fast, 4-6 hours
Enterobius vermicularis
Major cause of anemia in the tropics
Hookworm
3 species of hookworm
Necator americanus, Acyclostoma duodenale and celanicum
