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🦠microbiology review

Giardiasis

Written by the Fiveable Content Team • Last updated September 2025
Written by the Fiveable Content Team • Last updated September 2025

Definition

Giardiasis is an intestinal infection caused by the protozoan parasite Giardia lamblia. It leads to gastrointestinal symptoms such as diarrhea, cramps, and nausea.

5 Must Know Facts For Your Next Test

  1. Giardia lamblia is transmitted through contaminated water or food.
  2. The infection often causes prolonged diarrhea lasting several weeks.
  3. Diagnosis is typically made via stool examination for cysts and trophozoites.
  4. Treatment usually involves antiprotozoal medications like metronidazole.
  5. Preventive measures include drinking filtered or boiled water and practicing good hygiene.

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