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Explain the pathogenic mechanism of Giardia.   Be sure to include what cell type the pathogen invades, how...

Explain the pathogenic mechanism of Giardia.   Be sure to include what cell type the pathogen invades, how the organism invades, and why this contributes to both the symptoms and prognosis of the disease.

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Answer: Giardia Pathogenesis

  1. Target Cell Type:

    • Invades enterocytes (epithelial cells lining the small intestine).

  2. Invasion Mechanism:

    • Adhesion: Uses a ventral suction disk to attach to intestinal villi.

    • Toxin-Free Damage: Disrupts tight junctions between cells, causing malabsorption.


  3. Symptoms & Prognosis:

    • Symptoms: Watery diarrhea, steatorrhea (fatty stools), bloating (due to malabsorption of fats/nutrients).

    • Prognosis: Self-limiting in healthy individuals; chronic in immunocompromised patients.


Key Point: Giardia does not invade tissues but flattens villi, reducing surface area for absorption.


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