Effectiveness of Diethylcarbamazine in Treating Loiasis Acquired by Expatriate Visitors to Endemic Regions: Long-Term Follow-Up

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Abstract
Although successful treatment of loiasis with diethylcarbamazine (DEC) has been reported, little is known about the long-term success rate of therapy or the predisposing factors for treatment failure. To address these questions, 32 patients were followed 2-15 years (median, 4.5) after DEC treatment; all had acquired infection while expatriate visitors to endemic areas of Africa. Using a strict definition of successful treatment, 12 (38%) appeared to be cured after one course of therapy and 5 (16%) after two courses. Of the remaining 15 patients, 3 continued to be symptomatic despite more than four courses of treatment. Although 12 of the 17 patients who relapsed did so within 1 year of treatment, severalhad relatively long asymptomatic periods (2-8 years). There was no predictive difference in clinical or laboratory parameters (including eosinophilia and specific filarial serology) between patients requiring one or more courses of therapy.

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