It never was. Giardia was well known to the
mountain men as "Beaver Fever". 150 years ago people just expected to get
digestive upsets at frequent intervals. If you don't know about the germ
theory of disease, you just figure it is bad luck or divine wrath or
whatever.
Frequent digestive upsets and the "cure" have just
allowed the documentation of the exact location of Traveler's Rest from the
Lewis and Clark expedition.
(Yes I am aware that L &C had lots of nutrition
problems relating to their Atkins friendly diet and no vitamins_
Ed
Ed & Wendy Hauser 2994 Mittower
Road Victor, MT 59875