Final Exam
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, Ascaris Giant intestinal roundworm; can cause intestinal obstruction and lung migration
(Loeffler syndrome).
Babesia Tick-borne intraerythrocytic parasite; Maltese cross formation; hemolytic anemia.
Balantidium Only ciliated protozoan infecting humans; associated with pigs.
Cryptosporidium Acid-fast oocysts; severe watery diarrhea in AIDS patients; chlorine resistant.
Cyclospora Prolonged watery diarrhea; linked to raspberries/cilantro; acid-fast variable.
Echinococcus Hydatid cysts in liver/lungs from dog tapeworm; cyst rupture can cause anaphylaxis.
Entamoeba histolytica Flask-shaped ulcers and liver abscesses; trophozoites with ingested RBCs.
Enterobius Pinworm; nocturnal perianal itching; Scotch tape test.
Giardia "Beaver fever"; foul-smelling greasy diarrhea; pear-shaped trophozoites.
Naegleria fowleri "Brain-eating amoeba"; rapidly fatal meningoencephalitis from warm freshwater.
Plasmodium Malaria transmitted by Anopheles mosquito; cyclical fevers; infects RBCs.
Schistosoma Only major blood fluke; freshwater snail vector; eggs with spines.
Strongyloides Autoinfection cycle; hyperinfection in immunocompromised patients.
Taenia Tapeworm from undercooked pork/beef; T. solium causes
cysticercosis/neurocysticercosis.
Toxoplasma From cat feces/undercooked meat; congenital triad and brain abscesses in AIDS.
2026