The Zika virus continues to be top of mind for travelers, especially now that locally transmitted cases of the mosquito-borne virus have been reported in Miami, where almost five million cruisers set sail every year. For many cruisers, there's no cause for alarm. But it's still a good idea to know how to prevent the virus, especially if you or your partner are pregnant or could become pregnant, or if you have a weak immune system. Here’s what you should do to best protect yourself.