Giardiasis (pronounced "jee-ar-DYE-uh-sus"), or giardia, is an infection of the intestines caused by the parasite Giardia lamblia. You may become infected with giardia if you eat food or drink water that is tainted with human or animal waste. You can also get giardia by coming into close contact with an infected person. The illness is most often a problem in developing countries where tap water is not safe; but you can get giardiasis in developed countries, too. In the U.S. and Canada, you can get giardia by drinking untreated water from wells, streams, rivers, and lakes. This is true even in mountain lakes and streams, where the water may seem pure. Follow the links below to find WebMD's comprehensive coverage about how giardiasis is contracted, what it looks like, how to treat it, and much more.
Giardiasis: What You Need to Know About Giardia
Giardiasis is one of the most common intestinal parasites. If it’s in the water you drink or a diaper you change, you’re more likely to have tummy trouble.
Know Your Risks for Food Poisoning
Are you at risk for food poisoning? Learn the foods and behaviors that can keep you safe.
The Basics of Food Poisoning
From symptoms to treatment to prevention, get the basics on food poisoning from the experts at WebMD.
WebMD's tips on preventing diarrhea.
Preventing Dehydration When You Have Diarrhea or Vomiting
A prolonged bout of diarrhea or vomiting can cause the body to lose more fluid than it can take in, resulting in dangerous dehydration.
Diarrhea: Triggers and Treatments
What is starting your chronic diarrhea? How can you treat it? We’ve got the answers you’re looking for.
What Causes Diarrhea?
The average adult has diarrhea four times a year, often caused by food, medication, stress, or, sometimes, an underlying medical problem.
Travelers' Diarrhea: What You Need to Know
WebMD asks CDC expert Phyllis Kozarsky about travelers’ diarrhea and its causes, symptoms, prevention and treatment.