Zika outbreak: Miami teams increase mosquito control efforts at stadiums

The Dolphins' stadium is more than 10 miles (16 kilometers) from the nearest area of the virus outbreak. Even so, the Dolphins say they decided weeks ago to undertake additional treatments as a precaution.

The Marlins and Miami-Dade County have stepped up spraying in and around Marlins Park "in an abundance of caution," team president David Samson said Thursday. Treatments targeting the mosquito that transmits Zika are being used even though the Marlins play most of their home games indoors under a retractable roof.

Marlins Park is about 2 miles (3.2 kilometers) from the nearest area of virus outbreak.

Backpack foggers will be used every two weeks, with treatments timed for a few days before games. The Dolphins' pest control provider also has removed standing water and treated larvae.