Parasitology - Schistosomes

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Author:
zf2010
ID:
104159
Filename:
Parasitology - Schistosomes
Updated:
2011-09-25 12:51:23
Tags:
Schistosomes
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Description:
Schistosomes
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  1. Schistosome general facts
    • Different sexes
    • Mollusk intermediate host
    • Cecaria is infective stage
    • Infection via skin penetration
    • Infects blood
  2. Schistosoma mansoni cercaria
  3. S. Mansoni egg
  4. S. japonicum egg
  5. S. haematobium egg
  6. Miracidium - hatches from eggs
  7. Schistosoma mansoni - Where?
    • Africa
    • Middle East
    • S. America
    • Caribbean
  8. Schistosoma mansoni - Life Cycle?
    • Cecaria penetrate unbroken skin
    • Mature in liver
    • Adults usually in inferior mesenteric vein (lower colon)
  9. Schistosoma mansoni - Diagnosis?
    O&P in stool
  10. Schistosoma japonicum - Where?
    East Asia
  11. Schistosoma japonicum - Life Cycle?
    • Cecaria penetrate unbroken skin
    • Mature in liver
    • Adults usually in superior mesenteric, interior mesenteric veins and caval system (small and large intestine)
  12. Schistosoma japonicum - Diagnosis?
    O&P in stool
  13. Schistosoma haematobium - Where?
    Africa, Mediterranean, India
  14. Schistosoma haematobium - Life Cycle?
    • Cecaria penetrate unbroken skin
    • Mature in liver
    • Adults usually in vesical, prostatic and uterine plexuses
  15. Schistosoma haematobium - Diagnosis?
    Eggs in urine
  16. Other schistosomas
    • S. mekongi
    • S. intercalatum
  17. Schistosoma presentation
    • Petechial hemorrhage at penetration with pruritis, edema
    • Acute hepatitis
    • Liver tenderness
    • Diarrhea or hematuria
    • Hepatosplenic and intestinal symptoms
    • Can involve lungs, brain
  18. Schistosomiasis - Treatment?
    Praziquantel
  19. Schistosomal dermatitis
    • Penetration of skin by schistosome cercaria that normally infects birds
    • Cannot produce infection
    • Produces swimmer's itch

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