A 25-year-old man has profuse watery, nonbloody diarrhea but has no fever. He is HIV-positive, and his current CD4 T-cell count is 50. 1. Which of the following is least likely to be the cause of his...

A 25-year-old man has profuse watery, nonbloody diarrhea but has no fever. He is HIV-positive, and his current CD4 T-cell count is 50.

1. Which of the following is least likely to be the cause of his symptoms?

a. Cyclospora cayetanensis

b. Entamoeba histolytica

c. Enterocytozoon bieneusi

d. Cryptosporidium parvum

2. How would you make the diagnosis?

3. What is the mode of transmission of the possible etiologic agents?

a. Aerosol

b. Percutaneous

c. Fecal-oral

d. Vector