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Miami-Dade mosquito control worker Carlos Vargas dumps a barrel of standing water that can incubate the Aedes aegypti mosquito larvae at a home in Miami, Florida, on June 08, 2016. 
Of the forty different types of mosquito found in Miami -Dade the Aedes aegypti mosquito or yellow fever mosquito is responsible for transmitting diseases such as the Zika Virus.  / AFP / RHONA WISE / TO GO WITH AFP STORY by Leila MACOR, "Florida health warriors deploy in war on Zika"        (Photo credit should read RHONA WISE/AFP/Getty Images)
Miami-Dade mosquito control worker Carlos Vargas dumps a barrel of standing water that can incubate the Aedes aegypti mosquito larvae at a home in Miami, Florida, on June 08, 2016. 
Of the forty different types of mosquito found in Miami -Dade the Aedes aegypti mosquito or yellow fever mosquito is responsible for transmitting diseases such as the Zika Virus.  / AFP / RHONA WISE / TO GO WITH AFP STORY by Leila MACOR, "Florida health warriors deploy in war on Zika"        (Photo credit should read RHONA WISE/AFP/Getty Images)

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Top health official: Zika outbreak in U.S. could worsen

Dr. Anthony Fauci tells CNN's Jake Tapper, if Zika virus is not contained, it could lead to a "sustained spread" in a wider region in the U.S.

Top health official: Zika outbreak in U.S. could worsen

Dr. Anthony Fauci tells CNN's Jake Tapper, if Zika virus is not contained, it could lead to a "sustained spread" in a wider region in the U.S.