Giardia is a microscopic, contagious parasite common in the Pacific Northwest. It causes the gastrointestinal illness known as giardiasis. Giardia is found in contaminated water (such as puddles), soil, and food that has been contaminated with feces (poop) from infected humans or animals. Giardia can cause gastrointestinal signs such as diarrhea and vomiting, but can… Read more »