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Giardiasis Symptoms & Diagnosis


Symptoms usually start 5 to 28 days after infection. Not all people who are infected have symptoms. But, all people who are infected can transmit the disease.

Symptoms may include:

  • Diarrhea , acute or chronic
  • Loose, greasy, foul-smelling stools
  • Abdominal pain or cramps
  • Bloating
  • Gas
  • Nausea or vomiting
  • Weight loss
  • Mild fever (rare)


The doctor will ask about your symptoms and medical history, and perform a physical exam. Tests may include:

  • Laboratory exam of several (usually three) stool samples
  • Stool testing for Giardia proteins (called the Giardia antigen test)
  • In some cases, testing of a fluid or tissue sample from the intestine

If you are diagnosed with giardiasis, everyone living in your household should be tested for infection as well.

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