American scientists are warning, it could be a decade before a Zika vaccine is developed.
In the past year, the virus has exploded, with the latest case confirmed in Arlington, Virginia, just outside the American capital city.
Scientists are worried about the rising rate of micro-cephaly among pregnant women, possible sexual transmission and the upcoming Olympic Games in Brazil, where the majority of the infections are.
U.S. State Department deputy spokesman Mark Toner says they are working with the U.S. Centers for Disease Control to keep travelling Americans informed.
IN: "There's a lot...
OUT: ...their travel."
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