Malaria epidemiology differs greatly in the geographically close islands of the southwestern Indian Ocean. In Madagascar and the Comoros Union malaria is still a major public health problem. In Mayotte indigenous transmission resumed in 1995 and is currently high in some communities. In the Mascarene Islands (Reunion and Mauritius), indigenous transmission has been eradicated (Reunion) or become rare (Mauritius). The Seychelles Islands are malaria-free since local conditions are unfavorable for Anopheles mosquitoes. The level of resistance to antimalarials also differs from one island to another. Resistance to chloroquine ranges from moderate in Madagascar to high in the Comoros Union. Health recommendations for travelers must be adapted to the epidemiological features on each island.
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