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Malaria Chemoprophylaxis using Proguanil/Dapsone Combinations on the Thai-Cambodian Border

The Thai-Cambodian border is a difficult area in which to provide adequate malaria chemoprophylaxis because of multiple drug-resistant Plasmodium falciparum. In 1990–1991, Thai soldiers were randomly selected to receive proguanil (200 mg/day) combined with dapsone (4 mg or 12.5 mg/day) (n = 184) or pyrimethamine/dapsone (12.5 mg and 100 mg/week) (n = 177). Doxycycline (100 mg/day) was given to men with glucose-6-phosphate dehydrogenase deficiency (n = 77). Falciparum malaria attack rates were the same whether proguanil/dapsone (10.3%) or pyrimethamine/dapsone (11.3%) was used. However, proguanil/dapsone was more effective than pyrimethamine/dapsone in preventing vivax malaria (1.6% versus 12.4%). Men receiving doxycycline had falciparum malaria (3.9%) and vivax malaria (1.3%) at low rates. Adjusting the dapsone component from 4 mg to 12.5 mg did not improve the prophylactic effectiveness. Hematologic toxicity was not observed with the proguanil/dapsone combination. We conclude that proguanil/dapsone is not a useful alternative for malaria chemoprophylaxis on the Thai-Cambodian border.

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