This will probably depending on which country you're going to and how far off the beaten path (urban versus jungle). It might be best to check with a travel clinic. Most cities in the US have them, presuming you're in this US...if not, they might be able to give you this info over the phone. The CDC has a table on malaria by country: CDC - Malaria - Travelers - Malaria Information and Prophylaxis, by Country
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