Giardia has long been considered the scourge of the backcountry, where every water body was assumed to contain a healthy population of these critters or some other related pathogen. Ingestion of this parasite often results in giardiasis, popularly known as beaver fever, a common form of gastroenteritis, characterized by a combination of diarrhea, vomiting, abdominal pain and cramping.
Although most backcountry explorers deal with the threat of giardiasis and other illness-inducing pathogens by some combination of boiling, chemical treatment or filtering, some chose to disregard all warnings and drink directly from natural water sources.
Are they insane? » Continue Reading.