30 percent of those infected show no symptoms. So many are infected and have no idea. You are only contagious to Mosquitos in the first week or so after you are infected. A mosquito bites an infected person in the first week or so of the disease. Anyone ever bitten by that mosquito in the future would likely be infected. Ashore in the hours 4-6 or anywhere near sunset are at the greatest risk of bite. The more crowded the area with long term residents or extended stay travelers the greater risk. There simply is not enough time for someone staying a week to get infected and infect mosquito on the same trip. Places like Cane Garden Bay would have the greatest chance at Russian Roulette here. The resorts with larger numbers of employees another.