The following is true of Giadiasis except –
**Core Concept**
Giardiasis is an intestinal infection caused by the protozoan parasite Giardia lamblia, which leads to malabsorption and diarrhea. Giardia attaches to the intestinal mucosa, causing damage to the brush border and altering the intestinal absorption of nutrients.
**Why the Correct Answer is Right**
Giardiasis is characterized by malabsorption of fats, carbohydrates, and proteins due to the damage to the intestinal mucosa. The parasite adheres to the enterocytes, leading to a decrease in the activity of enzymes such as lactase and sucrase, resulting in malabsorption of lactose and sucrose. Giardia also causes an increase in the permeability of the intestinal mucosa, leading to the loss of electrolytes and water.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because Giardiasis is not typically associated with an increase in intestinal motility. In fact, Giardia can cause a decrease in intestinal motility, leading to constipation or diarrhea.
**Option B:** This option is incorrect because Giardiasis is not typically associated with an increase in the production of mucus. While Giardia can cause an increase in the production of mucus in some cases, this is not a characteristic feature of the disease.
**Option C:** This option is incorrect because Giardiasis is not typically associated with a decrease in the absorption of vitamin B12. While Giardia can cause malabsorption of various nutrients, vitamin B12 absorption is not typically affected.
**Clinical Pearl / High-Yield Fact**
Giardiasis can be diagnosed using a variety of tests, including stool antigen tests, stool culture, and endoscopic biopsy. Treatment typically involves the use of antiparasitic medications such as metronidazole or albendazole.
**Correct Answer: D.**