Parasites, enteric protozoa- Summary.docx

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Microbiology and Immunology
Microbiology and Immunology 2500A/B
John Mc Cormick

Enteric Protozoa - Travel associated - Longer incubation than bacteria/virus - NO parasites are normal flora- if any, then came from contamination - Stained stool; cannot culture - Cysts (infective) & smaller than, trophozoites (active) 1) Giardia intestinalis 2) Entamoeba histolytica 3) Dientamoeba fragilis - beaver fever - colitis/ulceration - bloating - duodenum, gassy stools - liver/lung/brain invasive abscess - NO cyst stage - residual lactose intolerance - trophs – engulfed RBCs - spread on pinworm eggs - resistant to chlorine - E. dispar (NOT pathogenic)- (iodine better) looks same except no RBCs 4) Cryptosporidium parvus & hominis 5) Cylcospora cayetanensis - contaminated water- farm runoff, pools, splash pads - tropical fruits - self-limited diarrhea - intractable in AIDS Blood & Tissue Parasites A. Plasmodium - malaria - transmission: anopheles mosquitoes- night biters - tropical fever = malaria until proven otherwise (blood film examination) - P. falciparum- deadly in nonimmune hosts- because attacks RBC’s of all ages - ser
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