Difference between revisions of "Cryptosporidium"

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[[Image:Cryptosporidium muris.jpg|thumb|right|150px|''C. muris'' - Wikimedia Commons]]
 
[[Image:Cryptosporidium muris.jpg|thumb|right|150px|''C. muris'' - Wikimedia Commons]]
 
[[Image:Cryptosporidium Life Cycle.jpg|thumb|right|150px|''Cryptosporidium'' Life Cycle - Alexander J. da Silva, PhD/Melanie Moser (PHIL #3386), 2002]]
 
[[Image:Cryptosporidium Life Cycle.jpg|thumb|right|150px|''Cryptosporidium'' Life Cycle - Alexander J. da Silva, PhD/Melanie Moser (PHIL #3386), 2002]]
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[[Image:Calf.jpg|thumb|right|150px|Calf - nabrown RVC]]
 
*Minute protozoan parasite
 
*Minute protozoan parasite
  

Revision as of 17:59, 23 November 2008



Infectious agents and parasitesWikiBugs Banner.png
PARASITES
PROTOZOA



Recognition

C. muris - Wikimedia Commons
Cryptosporidium Life Cycle - Alexander J. da Silva, PhD/Melanie Moser (PHIL #3386), 2002
Calf - nabrown RVC
  • Minute protozoan parasite
  • Wide host range
  • Parasitises epithelial cells lining the epithelial cells lining the ailimentary and respiratory tracts
  • Developmental stages confined to the microvillous brish border
  • C. parvum most associated with disease in domestic animals and in humans
    • Other species affect birds
  • Small oocysts of 4-5μm

Life Cycle

  • Direct life cycle
    • Only one host
    • Homoxenous
  • 1 week prepatent period
  • Sporulated oocysts past in faeces
  • Autoinfection can occur
    • Thin walled oocysts
  • Faecal-oral transmission also occurs
    • Thick walled oocysts

Pathogenesis

  • Causes outbreaks of diarrhoea in young animals
  • Common infection in AIDS patients

Epidemiology

  • Direct faecal-oral infection
    • E.g. School parties visiting farms
  • Water-bourne infection
    • E.g. contaminated water supply may infect hundreds of people
    • Difficult to locate source

Diagnosis

  • Faecal smear
    • Ziehl-Neelson (ZN) stain
    • Oocysts stain red against a blue/green background
  • Immunoassays
    • Detect oocysts in faeces

Control

  • Isolate/quarantine brought-in calves
  • Good hygiene, adequate bedding, disinfection of calf pens is important
  • Prevention/treatment
    • Halofuginone
      • Halocur or Intervet
      • Oral dosage