Previous experience with dengue outbreaks in Puerto Rico has shown that even small amounts of standing water — as in the vases of cemeteries — can serve as breeding areas for the mosquitoes that carry dengue and Zika.
Pan American Health Organization/Flickr
This is one of several canals that will be filled to slow the movement of water through the Everglades, restoring an ecosystem environmentalist Marjory Stoneman Douglas called the "river of grass."
Sporadic dengue fever outbreaks in Florida in 2009 and 2010 spurred mosquito control efforts in Key West and Miami Beach, shown here. The same mosquito that carries dengue, Aedes aegypti,can transmit Zika.
Joe Raedle/Getty Images
Passengers travel on one of the ferries that cut across Havana Bay from Casablanca to Old Havana in July 2015. While the Obama administration has approved licenses to companies that want to offer services to Miami, the plans are still controversial on both sides.
A U.S. Coast Guard crew (foreground) with six Cubans who were picked up in the Florida Straits in May. A larger Coast Guard vessel is in the background. The number of Cubans trying to reach the U.S. has soared in the past year. Many Cubans believe it will be more difficult to enter the U.S. as relations improve, though U.S. officials say there will be no rule changes in the near term.