Giardia lamblia: Difference between revisions
From IDWiki
Giardia lamblia
(Created page with "* A member of the Giardia species that causes intestinal disease in humans and animals {{DISPLAYTITLE:''Giardia lamblia''}} Category:Protozoa Category:Gastrointesti...") |
No edit summary |
||
| Line 1: | Line 1: | ||
* A member of the [[Giardia species]] that causes intestinal disease in humans and animals |
* A member of the [[Giardia species]] that causes intestinal disease ('''giardiasis''') in humans and animals |
||
* Also known as '''beaver fever''' |
|||
== Microbiology == |
|||
* Flagellated protozoan that infects the small bowel |
|||
* Host specificity related to genotype ("assemblage") |
|||
** Assemblages A & B infect humans, but also numerous non-human hosts including primates, dogs, cars, cattle, sheep, deer, rodents, horses, and beavers |
|||
** Assemblages C & D affect dogs; E affects cattle, goats, sheep, and pigs; F affects cats; G affects rodents; and H affects marine vertebrates |
|||
* Antigenic variation is determined by the variant-specific surface protein (VSP) |
|||
** Replaced every few generations |
|||
== Life Cycle == |
|||
* A cyst is ingested via fecal-oral contamination |
|||
* In the small bowel, the cyst releases two trophozoites (free-living form) via excystation |
|||
* Trophozoites multiply by binary fission |
|||
* When they reach the large bowel, they encyst |
|||
== Epidemiology == |
|||
* Worldwide distribution |
|||
* Numerous animal reservoirs, not fully understood how important they are |
|||
* Cysts can survive several months in cold water |
|||
{{DISPLAYTITLE:''Giardia lamblia''}} |
{{DISPLAYTITLE:''Giardia lamblia''}} |
||
Revision as of 01:04, 9 October 2019
- A member of the Giardia species that causes intestinal disease (giardiasis) in humans and animals
- Also known as beaver fever
Microbiology
- Flagellated protozoan that infects the small bowel
- Host specificity related to genotype ("assemblage")
- Assemblages A & B infect humans, but also numerous non-human hosts including primates, dogs, cars, cattle, sheep, deer, rodents, horses, and beavers
- Assemblages C & D affect dogs; E affects cattle, goats, sheep, and pigs; F affects cats; G affects rodents; and H affects marine vertebrates
- Antigenic variation is determined by the variant-specific surface protein (VSP)
- Replaced every few generations
Life Cycle
- A cyst is ingested via fecal-oral contamination
- In the small bowel, the cyst releases two trophozoites (free-living form) via excystation
- Trophozoites multiply by binary fission
- When they reach the large bowel, they encyst
Epidemiology
- Worldwide distribution
- Numerous animal reservoirs, not fully understood how important they are
- Cysts can survive several months in cold water
