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9 Cards in this Set

  • Front
  • Back
What is Cryptococcus?
It is caused by the yeast Cryptococcus neoformans, which is found worldwide. It is abundant in soil and pigeon droppings, though the birds are not infected.
How is it diagnosed?
It has a characteristic thick capsule that surrounds the budding yeast cell. A positive India ink test on cerebrospinal fluid may give a quick diagnosis of C. meningitis.
What is the most common form?
A mild subclinical lung infection. In immunocompromised patients it may disseminate to the brain and meninges, which is often fatal.
How is it treated/
Antifungal drugs such as Amphoteracin B and Flucytosine. The stage of disease often determines the course of treatment.
Fluconazole is the drug of choice for prevention of cryptococcal meningitis in AIDS patients.
What is Giardia?
It is an intestinal protozoal infection. It has 2 life stages.
1. binucleate trophozoite that has 4 flagella.
2. four nucleate cyst which is drug resistant. ingested cysts form trophozoites in the duodenum where they attch to the wall but do not invade.
Why are Giardia fecal samples often negative despite infection?
because they inhabit the duodenum, however a commercial immunologic ELISA test to measure Giardia antigen in fecal material is occasionally useful.
What is an effective treatment?
Metronidazole(Flagyl). They are often resistant to chlorine concentrations used in most treatment facilities.
List three protozoal infections?
1. Amebic dysentary
2. Giardia lamblia
3. Cryptosporidiosis
Giardiasis is the most commonly diagnosed parasitic infection in the US. TRUE/FALSE