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Giardia as a zoonosis (or not)

Omar O. Barriga barriga.2 at osu.edu
Wed Aug 27 22:35:22 EST 1997

In article <01bcb326$f7fe5260$2901ad24 at hugo> "Andy Fell" <ahfell at netmatters.co.uk> writes:
In article <01bcb326$f7fe5260$2901ad24 at hugo> "Andy Fell" <ahfell at netmatters.co.uk> writes:
>From: "Andy Fell" <ahfell at netmatters.co.uk>
>Newsgroups: bionet.parasitology
>Subject: Giardia as a zoonosis (or not)
>Date: 27 Aug 1997 20:23:12 GMT
>Organization: Stanford
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>Message-ID: <01bcb326$f7fe5260$2901ad24 at hugo>
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>X-Newsreader: Microsoft Internet News 4.70.1162
>Xref: magnus.acs.ohio-state.edu bionet.parasitology:2683

>Would anyone like to comment on whether G. lamblia/G. duodenalis is
>transmitted between humans, dogs and cats, or whether strains/sub-species
>are host-specific? 
>And when hikers get Giardiasis by drinking water from beaver ponds, what
>species is it? 

>Andy Fell

	Animals have been infected with Giardia of human origin on a few 
ocsasions and circunstancial evidence suggests that humans have been 
infected with Giardia from beavers or muskrats. Antigenic and isoenzyme exams 
could not distinguish between Giardia of human or animal origin.
	In my opinion, there is no doubt that Giardia is a zoonotic infection.  
How important the animal source is as compared to the human source is still a 
matter of debate. It seems to me that, under normal circumstances, most human 
infections are acquired from another human.
	Only three species of Giardia are accepted nowadays: G. intestinalis
(= G. lamblia) of humans and other mammals, G.  muris of rodents, birds, and 
reptiles, and G. agilis of frog tadpoles.	
			Omar O. Barriga

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