Women in crowded, muddy slums of Brazil's chaotic cities have little defense against the Aedes aegypti mosquito that carries...
Zika is now present in 23 countries and territories in the Americas.
He said the timeline to make the vaccine available by year's end is aggressive, but possible.
Kleisse was five months pregnant when she came down with Zika, which causes mild flu-like symptoms and a rash.
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As of Thursday, cases have been reported in 23 countries and territories in the region
The Zika virus is now reported in at least 25 countries and territories in the Americas
The mosquito-borne Zika virus has been linked to brain damage in thousands of babies in Brazil.