Global health officials are racing to better understand the Zika virus behind a major outbreak that began in Brazil last year and has since spread to many countries in the Americas.
Brazilian President Dilma Rousseff vows to "win the war" against the Zika virus, but some experts criticized her government's response and warned the Olympics could fuel the disease's spread.
Global health officials are racing to better understand the Zika virus behind a major outbreak that began in Brazil last year and has since spread to many countries in the Americas.
Brazilian President Dilma Rousseff vows to "win the war" against the Zika virus, but some experts criticized her government's response and warned the Olympics could fuel the disease's spread.