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["Don Bowen" <don.bowen AT earthlink.net>]

> Think of the pioneers, traveling a few miles each day, stopping to
> camp when possible by a spring or a stream, replenishing their
> supplies. 'Course we don't know how many died along the way.

The biggest problem was not Giardia byt Typhus and othere fecal born human
pathogens.  

I recently read an article about Beavers and Giardia.  It seems that Beavers
downstream of human camping grounds have a much higher incidence that those
further upstream.

Don Bowen  KI6DIU
http://www.braingarage.com/Dons/Travels/journal/Journal.html