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Charles J. O'Kelly okellyc at ophelia.BCH.UMontreal.CA
Sun Apr 30 16:02:16 EST 1995

In article <3o0hu3$qs4 at chaos.dac.neu.edu> bnorum at lynx.dac.neu.edu (Becky Norum) writes:
>MissAndree (missandree at aol.com) wrote:i


>: are giardias amoebas, or an entirely different parasite? Do you
>: get all of these from water (which I tried to avoid,) or do you get them
>: from food, dirt, etc.
>This is what I have picked up in my Parasitology class:


>B-  The only amoeba of real significance in humans is Entamoeba histolytica.

consider also Naegleria fowleri and related species, and Acanthamoeba spp.

>C-  Classification
>	1-  Both are in:
>		a-  Kingdom Protista
>		b-  Subkingdom Protozoa
>		c-  Phylum Sarcomastigophora
>	2-  Entamoeba histolytica
>		a-  Subphylum Sarcodina  (Amoebas)
>	3-  Giardia
>		a-  Subphylum Mastigophora (Flagellates)

this is the 1980s "received" zoological classification, now known to be
in error.  Both -Giardia- and -Entamoeba- lack mitochondria, and at least
in the case of -Giardia- this absence of mitochondria is thought to be
ancestral (i.e. they never had any).  Hence -Giardia- and -Entamoeba- may
be more closely related to each other than -Giardia- is to any other
flagellates (except other members of the "diplomonad" group to which it
belongs) and -Entamoeba- is to any other amoeba.

for a more refined, though still very very "buggy" and controversial,
classification, see:

Cavalier-Smith T.  1993.  Microbiological Reviews 57: 953.

a hint of the developing structure of protist classification may be obtained
online via the various pages of the Protist Image Database, http://megasun.


>E-  Both are geneally passed on through the water supply, infected
>generally through feces.

also soils and anything (like fresh veggies) washed in unclean water.

charley o'kelly
mad protistologist
okellyc at bch.umontreal.ca
okellycj at nh.ngs.net

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