A 19-year-old man visits the doctor because he has been suffering from diarrhea for the past four months. He went to a student health center at his university a month ago and was given medicines, but his diarrhea did not improve. He also experiences continuous nausea, bloating, and a weight reduction of 6.8 kg (15 lb). The exhibit shows a microscopic inspection of his faeces for ova and parasites after trichrome staining. Impairment of which of the following immune functions would most likely predispose to this patient's infection?

Question

A 19-year-old man visits the doctor because he has been suffering from diarrhea for the past four months. He went to a student health center at his university a month ago and was given medicines, but his diarrhea did not improve. He also experiences continuous nausea, bloating, and a weight reduction of 6.8 kg (15 lb). The exhibit shows a microscopic inspection of his faeces for ova and parasites after trichrome staining.   Impairment of which of the following immune functions would most likely predispose to this patient's infection?

Quizplus · Accepted Answer

Eductional Objective: Giardia lamblia injures the mucosa of the duodenum and jejunum by sticking to the intestinal brush border and producing chemicals that promote a mucosal inflammatory reaction. The main component of adaptive immunity against G lamblia infection is secretory IgA, which affects adherence. IgA deficient conditions predispose people to persistent giardiasis.

A 19-Year-Old Man Visits the Doctor Because He Has Been