Also, how would he have gotten giardia unless he was drinking from gross lakes or something?
"The parasite lives in soil, food, and water. It may also be found on surfaces that have come into contact with animal or human waste.
You may become infected if you:
Are exposed to a family member with giardiasis
Drink water from lakes or streams where animals such as beavers and muskrats, or domestic animals such as sheep, have left their waste
Eat raw or undercooked food that has been contaminated
Have direct person-to-person contact in day care centers, long-term care homes, or nursing homes
Have unprotected anal sex"
http://www.nlm.nih.g...icle/000288.htm