What are the signs and symptoms of giardiasis?

Updated: Oct 01, 2018
  • Author: Hisham Nazer, MBBCh, FRCP, DTM&H; Chief Editor: Burt Cagir, MD, FACS  more...
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Clinical signs and symptoms of giardiasis include the following [8, 9, 18] :

  • Diarrhea

  • Malaise, weakness

  • Abdominal distention

  • Flatulence

  • Abdominal cramps

  • Nausea

  • Malodorous, greasy stools

  • Anorexia

  • Weight loss

  • Vomiting

  • Low-grade fever (infrequent)

  • Various neurologic symptoms (eg, irritability, sleep disorder, mental depression, neurasthenia)

  • Urticaria

The nature of the overall clinical manifestations in affected patients is influenced by numerous factors, including the parasite load, virulence of the isolate, and the host immune response.

Diarrhea is the most common symptom of acute Giardia infection, occurring in 90% of symptomatic subjects. Abdominal cramping, bloating, and flatulence occur in 70-75% of symptomatic patients.

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