Giardiasis

When to call your doctor

Call your health care provider if you have:

• Diarrhea, which often comes and goes.

• Stomach bloating or fullness.

• Upset stomach (nausea) or vomiting.

• Unplanned weight loss.

• Blood in your stool.

• Dehydration.

When to call 911

Call 911 if you have: 

• Uncontrolled vomiting.

• Severe belly pain.

How is giardiasis treated?

You will be examined and will likely have a stool sample checked in a lab. This stool is checked for the parasite that causes the disease. If giardiasis is suspected or confirmed, you will be prescribed an antibiotic that you take for 5 to 7 days. In many cases, this clears the infection.

Preventing giardiasis

Take these steps to help prevent infection with Giardia:

• Wash your hands with clean, running water (warm or cold) after using the bathroom and before eating. Wash for at least 20 seconds. Alcohol-based hand sanitizers may not work against Giardia.

• Wash your hands each time you change a child's diaper.

• Don't drink from rivers and streams.

• Use a water treatment kit when camping. 

• Wash or peel raw fruits and vegetables before using.