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looking for info on crypto and giardia

Judy/Bob Dilworth dilworth at megsinet.net
Fri Apr 9 16:03:13 EST 1999


I'm forwarding your post to bionet.parasitology.  You may get
information there, also.  I know what they look like under a microscope,
but don't know answers to your questions.

Judy Dilworth, M.T. (ASCP)
Microbiology


Ed Stevens wrote:
> 
> Hello, All.
> 
> I am an Assistant Scoutmaster with a Boy Scout troop in TN.  I am
> heavily involved in training new adult leaders in basic outdoor
> skills.  I am searching for some _authoritative_ information regarding
> the use of heat and iodine for purifying water in the backcountry.  So
> far my research on the Web has led to a lot of stuff that was either
> over my head or dealt with treating public water supplies.  I have two
> basic questions.
> 
> First, at what temp. are cryptosporidium and giradia killed, or at
> least rendered "not a problem."  I have heard through unverifiable
> sources that the temp. is somewhere around 120 deg. F.  If this is
> true, then I would think that even at the highest altitudes at which
> surface water is found the boiling point would be well above this and
> by the time water comes to a boil, regardless of the altitude, these
> nasties are dead.  If this is true, then the common recommendations of
> "boiling for x minutes" are overkill.
> 
> Second, I have heard (again through unverifiable sources ) that crypto
> and girardia, being transmitted as a hard-shelled cyst, are not
> affected by common iodine treatment.
> 
> Comments on either of these?  Are there any authoritative sources
> addressing these questions that I could use as a reference?
> 
> Thanks.
> 
> - Ed Stevens
> Ed Stevens/TN



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