Mosquitos can carry dengue fever, so it's best to protect yourself. I don't know about Negril but there are a lot of them in the rural part of Westmoreland where I live. If you do get dengue, go to a local doctor - it just needs bed rest and possibly supportive treatment like IV rehydration, which Jamaican medicine is quite capable of treating. Don't try to fly home, since in the US, at least the northeast, they never see dengue and have no clue about it (and you don't want to be flying when sick with dengue).

Richard (who's been through it!)