Go to content Go to navigation

› In Depth › Microbe Gallery
Microbe Gallery (Back to In Depth Menu)
  • Giardia
  • E. coli
  • Head lice
  • Influenza
  • Lyme Disease
  • Malaria
  • Norovirus
  • Tuberculosis
  • West Nile Virus

    • Giardia

    A parasitic disease
    What is it?
    Photo of GiardiaPhoto credit: CDC/ Janice Carr

    Giardia is a single-celled, microscopic parasite that can live in the intestines of humans and animals. Found world-wide, over the past two decades Giardia infections have become one of the most common waterborne diseases for people in the United States.

    How do I avoid it?

    • Wash your hands thoroughly with soap and water, especially after using the toilet, changing diapers or before handling or eating food.
    • Do not drink untreated water, including ice made from unsafe water.
    • When you can't avoid suspect water, boil it for at least one minute or use a filter rated for "cyst removal".
    • Wash and/or peel all raw vegetables and fruits before eating.

    What are the symptoms?

    A Giardia infection can cause a variety of intestinal symptoms, Including:

    • diarrhea
    • gas or flatulence
    • greasy stools that tend to float
    • stomach cramps
    • upset stomach or nausea
    These symptoms may lead to weight loss and dehydration. However, some people with Giardia have no symptoms at all.

    How do I get it?

    Like other food- and waterborne diseases, Giardia spreads when poop contaminates:

    • Food
    • Water, including swimming pools, hot tubs, Jacuzzis, fountains, lakes, rivers, springs, ponds or streams
    • Surfaces such as bathroom fixtures, changing tables, diaper pails or toys
    Accidentally putting something into your mouth that has come into contact with Giardia can lead to an infection.

    "); pageTracker._initData(); pageTracker._trackPageview();