It takes two to tango....
I gather there are no, or not many Haitians in Cabarete, or at least not many new arrivals from Haiti who may harbor the Plasmodium parasite in their blood. First, a mosquito has to bite the Haitian carrier, survive the ordeal ;-), and then bite a healthy person. Actually, the probabilities of contagion are quite low. So, avoiding mosquito bites (netting, repellants, etc), and of course, reducing the population of infected people (Trujillo, where are you? ;-), and folklore has it that high alcohol blood content makes you almost invulnerable to the Plasmodium parasite (at the expense of increasing your chances of liver disease ;-), will reduce your chances of getting malaria almost to nil...
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