I just returned from a week in south America, a few thoughts
I did not see mosquitos at all, in the summer in Brooklyn monsey, Catskills they are all over but there I just did not see them. Making it easy to stay clean with repellent.
There's very little talk about them and locals don't seem panicked at all
Places are packed with tourists
You need to research a country not as a whole only by city, example Panama is supposed to have Zika, but what I understand from the ppl there is that in Panama city area there have not been any cases of Zika only in the Caribbean coastal region.