Microbiology and Immunology 2500A/B Study Guide - Leishmaniasis, Pinworm Infection, Dientamoeba Fragilis
27 Dec 2013
School
Department
Professor
Document Summary
Four groups: ectoparasites: spiders, insects, maggots; enteric protozoa; blood and tissue protozoa; helminths: worms. Associated with travel longer incubation period than bacteria and viruses. The presence of any protozoa (even nonpathogenic varieties) in stool indicates exposure to contaminated food or water. Cysts are the infective form (very small). Protozoa are not normal flora; but some can be non pathogenic. Stools for ova & parasites (+ cysts): examination of permanent stained smear is best method of diagnosis for traveler"s diarrhea most likely bacterial than parasitic (protozoal or helminth) enteric protozoa. 3 negatives stools before you can confidently rule out pathogens: giardia intestinalis (lamblia) beaver fever. Most common cause of travel associated diarrhea. Acquired by contaminated water; waste of humans or waste of animals (beaver) Noninvasive, resistant to chlorination (in water purification), must be filtered out via sand, iodination is a more active halogen, more effective at removing giardia from water.
