I usually carry a net. Sooner or later I find myself using it--someone's grass hut, a porous guesthouse, an unscreened porch. In most areas of S. America I'm more concerned about dengue (and scorpions, ants, cockroaches....) than malaria, but unfortunate experience has me determined never to get malaria again.
100% DEET is no more effective than 50% DEET, which in turn is no more effective than 30% DEET. Do your own research.
Hope that's helpful.
Mark
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