Parasitology — Flashcards

Flashcard 151: Helminths whose eggs float in a saturated salt solution can be remembered by mnemonic: THE FAN:T_____Hymenolepis nanaEnterobius vermicularisFertilized eggs of Ascaris lumbricoidesAncylostoma duodenaleNecator americanus

Answer: richuris trichiura

Flashcard 152: _____ in stool is diagnostic of Giardia infection

Answer: Trophozoites

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

Answer: 4

Flashcard 154: _____ is a helminth that can cause intestinal obstruction at the ileocecal valve

Answer: Ascaris lumbricoides

Flashcard 155: _____, Feinberg-Whittington medium or PEM (Plastic envelope medium) are the media of choice for culturing Trichomonas vaginalis

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

Flashcard 156: 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 157: The _____ stage is never seen in the peripheral smear of Plasmodium falciparum malaria.

Answer: schizont

Flashcard 158: The steatorrhea in Giardia is hypothesized to stem from _____ of the mucosa and villous blunting in the duodenum and jejunum (location).

Answer: mechanical blockage

Flashcard 159: 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 160: How is the presence of hookworms (Ancylostoma duodenale, Necator americanus) diagnosed?_____, Eosinophilia

Answer: Eggs in stool O&P