Parasitology 2 Flashcards
How do you get neurocysticercosis instead of just intestinal infection with Taenia solium?
disseminated cysticercosis can happen if we ingest an egg rather than encysted larvae
Rx for Taenia solium / Taenia saginata?
Praziquantel
or albendazole?
Which parasite causes hydatid cyst disease?
Echinococcus granulosus
humans become infected by ingesting eggs but we are a dead-end host. the actual life cycle is b/t a dog and a sheep
Rx for Echinococcus granulosus?
surgery for cyst (inject w/ ethanol?), mebandazole in high doses
What is the major cause of pathology in Schistosoma mansoni infection?
hypersensitivity rxn to eggs
The male of which type of parasite has a “gynocophoric canal” that the female hangs out in so they’re constantly banging?
Schistosoma
What morphological form of Schistosoma is infective to snails?
miracidia
What morphological form of Schistosoma is infective to humans?
cercariae
which have matured from sporocysts
parasite with a ‘fork-like tail’
cercariae (mature larvae) of Schistosoma… this is the form infective to humans
Life cycle of Entamoeba histolytica?
humans ingest mature cysts (tetranucleated) from contaminated food, water, hands (fecal-oral transmission)
excystation occurs in alkaline small intestine, released trophozoites migrate to small intestine. trophozoites produce cysts which may be passed
Rx for Entamoeba histolytica?
metronidazole
typically followed by an agent for intraluminal killing like paromomycin or iodoquinol
Rx for Naegleria fowleri?
intrathecal ampho B
(but they’re probably gonna die anyway)
What aspect of basic parasitology distinguishes Trich from Entamoeba histolytica?
Trichomonas has no cyst form
Which worm is contracted by eating dog dookie that was infected by eating dead sheep?
Echinococcus
