Skip to content
My WebMD Sign In, Sign Up

Giardiasis

Font Size

Topic Overview

gast_01.jpg

What is giardiasis?

Giardiasis (say "jee-ar-DYE-uh-sus") is an infection of the intestines caused by the parasite Giardia lamblia.

The illness, also called giardia (say "jee-AR-dee-uh"), is most often a problem in undeveloped countries where tap water is not safe.

How can you become infected with giardia?

You may become infected with giardia if you eat food or drink water that is tainted with human or animal waste. In the United States 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 very pure.

You can get giardia from someone else through:

  • Close contact with someone who is infected.
  • Working in day care centers for young children. For example, if you change a diaper and don't wash your hands afterward, anything or anyone you touch could get infected. You could even get the illness yourself if you touch your mouth or eat food that you've touched. Children in day care centers are also more likely to get infected.
  • Working or living in nursing homes or other care centers where people may have poor bowel control and poor hygiene.
  • Some types of sexual contact, such as anal-oral contact.

What are the symptoms?

Giardia can cause diarrhea, stomach cramps, gas, and nausea. You may feel sick once and then get better. Or your symptoms may come and go for some time. Some children with giardiasis do not grow or gain weight normally. Sometimes giardiasis does not cause any symptoms.

After a person is exposed to the parasite, it usually takes 7 to 10 days for the infection to develop, but it can take from 3 to 25 days or longer. You can pass the infection to others during the entire time you are infected. You may be infected for months, even if you don't have symptoms.

How is it diagnosed?

Your doctor will ask questions about your past health and will do a physical exam to find out if you have giardiasis. He or she may also test your stool for the parasite that causes the infection.

1|2

WebMD Medical Reference from Healthwise

Last Updated: September 09, 2011
This information is not intended to replace the advice of a doctor. Healthwise disclaims any liability for the decisions you make based on this information.
Next Article:

Hot Topics

WebMD Video: Now Playing

Click here to wach video: Dirty Truth About Hand Washing

Which sex is the worst about washing up? Why is it so important? We’ve got the dirty truth on how and when to wash your hands.

Click here to watch video: Dirty Truth About Hand Washing

Popular Slideshows & Tools on WebMD

feet
Solutions for 19 types.
row of colored highlighter pens
Recognizing symptoms.
build a better butt
Check your BMI.
man with indigestion
How to build a better butt.
MS Overview
How to identify that bite.
stressed working woman
What to watch for.
brain scan with soda
Tips to kick the habit.
fat caliper
Tips for living better.
Woman running
And how to fix them?
lone star tick
Check your BMI.
young woman in sun
What Do Your Dreams Say About You?
Girl drinking orange juice
How to keep yours at bay.

Women's Health Newsletter

Find out what women really need.