Treatment and Prophylaxis ofIsospora belliInfection in Patients with the Acquired Immunodeficiency Syndrome

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Abstract
Enteric infection with the protozoan Isospora belli is common in patients with the acquired immunodeficiency syndrome (AIDS) and causes severe diarrhea. I. belli responds well to treatment with trimethoprim–sulfamethoxazole, but there is a high rate of recurrence. To investigate the effect of long-term prophylaxis, we studied 32 Haitian patients with AIDS complicated by I. belli infection and chronic diarrhea. All were treated with trimethoprim (160 mg) and sulfamethoxazole (800 mg), given orally four times a day for 10 days; the patients were then randomly assigned to receive 500 mg of sulfadoxine and 25 mg of pyrimethamine weekly, 160 mg of trimethoprim and 800 mg of sulfamethoxazole three times a week, or placebo.

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