Micro 6 Parasites Flashcards
Protozoa associated with water contamination outbreak
Cryptosporidium parvum
Entamoeba histolytica lifecycle
Trophozites replicate in intestine, encystation in colon, reingestion, excystation in gastric acid
Entamoeba histolytica pathology
- Afebrile dysentery (blood) or watery diarrhea
- Abscess in liver or brain
- Ulcer
Amebiasis risk
Poor sewage countries
E. histolytica Dx
- Microscopy of stools
- Serology
- CT for abscess
E. histolytica appearance
Gooey or cyst
Amebiasis ddx
MUCUS and blood in stool
No granulocytosis
No fever
Tx for all parasites
- Metronidazole for E. histolytica & G. lamblia
- Nitazoxanide for C. parvum
Giardia lamblia lifecycle
Same as ameba
Giardia lamblia risk
Beavers and Dogs
Giardia lamblia appearance
Ghost or cyst
Giardiasis ddx
- Watery diarrhea (no mucus, blood, PMN, fever)
- Flatulence, stinky greasy stools (malabsorption), lactose intolerance
Giardiasis Dx
ELISA antigen test, stool microscopy
Cryptosporidium parvum lifecycle
Same
Cryptosporidium parvum risk
Cows, anal sex, AIDS
-Chlorine resistant