Here in Toledo in the last year I personally know of 4 malaria and one dengue here in our village. We lived in Isabella Bank in belize district for two years and only know of one case of dengue. It does happen, but the chloroquin recommended for Belize is one of the least dangerous anti-malarials as I understand it. We took them for the first two years that we visited here before moving in full time. We have not taken them since moving here full time, but have seen enough cases to know it is around. I say that if you are a belt and suspenders kind of person, take the pills.