giardia and cryptosporidium

James Mahaffy mahaffy at
Tue Aug 16 09:49:40 EST 1994

> In article <JarmeySwan.7.2E49DBD3 at> JarmeySwan at (Claire.Jarmey)Swan) writes:
> >
> >I am interested in methods of contracting, detecting these protozoa. Also any 
> >statistics on cases due to giardia  and cryptosporidium
Mark responded:> Contracting these is usually facilitated by ingestion of contaminated water
> or perhaps food if treated with contaminated water or handled by 
> someone with the parasitewho also lacks sufficient higeine.
> The infective stage in both protists is a cyst.  Thus they can remain
> viable in the external environment for quite a while.

Giardia is interesting because it has alternate hosts in beaver and bear
and sometimes campers drinking "pure" mountain streams come down with
it. It is also a bit more common than you might think.  We have had a
couple outbreaks here in the Iowa farm community. 

James F. Mahaffy                   e-mail: mahaffy at
Biology Department                 phone: 712 722-6279
Dordt College                      FAX 712 722-1198
Sioux Center, Iowa 51250

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