Giardia is carried by bears and beavers, not just humans and pack animals. It's commonly known as "beaver fever", in fact, and by all accounts it is not a fun

Giardia is carried by bears and beavers, not just humans and pack animals. It's commonly known as "beaver fever", in fact, and by all accounts it is not a fun experience (2-6 weeks of explosive diarrhea for some).