Parasitology — Flashcards

Flashcard 151: The _____ stage is never seen in the peripheral smear of Plasmodium falciparum malaria.

Answer: schizont

Flashcard 152: _____ is a helminth that can cause intestinal obstruction at the ileocecal valve

Answer: Ascaris lumbricoides

Flashcard 153: Entamoeba histolytica has two stages: an infective _____-nuclei cyst stage and a(n) invasive trophozoite stage.

Answer: 4

Flashcard 154: _____, Feinberg-Whittington medium or PEM (Plastic envelope medium) are the media of choice for culturing Trichomonas vaginalis

Answer: CPLM (Cysteine-peptone-liver-maltose)

Flashcard 155: Non-Bile stained eggs can be remembered by the mnemonic **A HEN**: _____, Hymenolepis nana, Enterobius vermicularis, Necator americanus

Answer: Ankylostoma duodenale

Flashcard 156: _____ in stool is diagnostic of Giardia infection

Answer: Trophozoites

Flashcard 157: Schistosoma _____ has a small inconspicuous lateral spine (knob)

Answer: japonicum

Extra: Morphology of Schistosoma eggs: • **S. haematobium**: Large terminal spine. • **S. mansoni**: Large lateral spine. • **S. japonicum**: Small, inconspicuous lateral spine (often appears as a knob).

Flashcard 158: Strongyloides stercoralis, a helminth, enters the _____ through the feet, making their way to the lungs; mucociliary escalator eventually causes them to be swallowed into the GI tract

Answer: blood

Flashcard 159: Giardia lamblia cysts become trophozoites in the _____ when stimulated by gastric acid after ingestion.

Answer: duodenum

Flashcard 160: The _____ stage of E. histolytica exhibits pseudopods, which allow the organism to move along the intestinal wall and take up nutrients.

Answer: trophozoite