Malaria Prevention for Travelers to Madagascar

Chemoprophylaxis Selection

The Centers for Disease Control and Prevention (CDC) recommends atovaquone-proguanil, doxycycline, or mefloquine as first-line chemoprophylaxis for travelers to Madagascar, due to chloroquine-resistant P. falciparum malaria 1
Atovaquone-proguanil should be started 1-2 days before travel, continued daily during travel, and for 7 days after departure, as it has the shortest post-exposure duration of any regimen 1
Doxycycline 100 mg daily should be started 1-2 days before travel, continued daily during travel, and for 4 weeks after departure, but is contraindicated in pregnancy and children under 8 years 1
Mefloquine 250 mg weekly should be started 1-2 weeks before travel, continued weekly during travel, and for 4 weeks after departure, but should be avoided in patients with seizure history, psychiatric disorders, or those requiring precision movements 1

Pregnant women should use chloroquine as the safest option and carry Fansidar for presumptive self-treatment if fever develops and medical care is unavailable 1
Children under 15 kg should use chloroquine, as mefloquine and doxycycline are contraindicated 1

The CDC recommends combining chemoprophylaxis with rigorous mosquito avoidance measures, as no antimalarial regimen guarantees complete protection 2
DEET-based repellents at 20-50% concentration should be applied to exposed skin to provide optimal protection in malaria-endemic areas 2
Higher concentrations of DEET (up to 50%) provide longer protection time and should be considered first choice 2
Critical DEET application guidelines include applying sparingly only to exposed skin or clothing, avoiding high-concentration products on children's skin, and not applying to children's hands or wounds 3, 2

For travelers with prolonged exposure in Madagascar, primaquine 30 mg base daily during the last 2 weeks of the 4-week post-exposure prophylaxis period can prevent relapses of P. vivax and P. ovale, but requires mandatory G6PD testing and is contraindicated in pregnancy 1

Any fever or influenza-like symptoms during or after travel to Madagascar requires immediate medical evaluation with thick and thin malaria smears 2
Symptoms can develop as early as 8 days after initial exposure or as late as several months after leaving Madagascar, even after chemoprophylaxis has been discontinued 2
No antimalarial regimen guarantees complete protection, and malaria can still be contracted despite perfect adherence to all preventive measures 2