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CDC boss: More work ahead to fight Zika

The U.S. has a long way to go as it tries to a solution to the spread of Zika, Centers for Disease Control and Prevention Director Thomas Frieden said Friday.

"We are learning more about Zika literally every day, and we're doing more about Zika every day, but there's still much more that needs to get done," Frieden told CNBC's "Squawk on the Street."

On Friday, government officials met in Atlanta to discuss how to combat the arrival of Zika in the U.S.


"We need a few things here, to be very clear. First, if you're pregnant, don't travel to somewhere that has Zika spreading. Second, if you're a male who has traveled somewhere where there has been Zika, and your sexual partner is pregnant, use a condom with them every time," Frieden said.

Hundreds of people in the U.S. have contracted Zika, but these instances involved people who traveled places with high numbers of Zika cases, or have engaged in sexual relations with someone who has traveled somewhere where the virus is widespread.

The virus spreads primarily through the bite of the Aedes aegypti and Aedes albopictus mosquitoes.

According to the National Center for Atmospheric Research, 50 cities in the U.S. are at risk of being hit with the mosquito this year.