Rio Olympics only poses Zika threat to 4 countries: U.S. CDC (2)

WASHINGTON, July 14, 2016 -- Director of the U.S. Centers for Disease Control and Prevention (CDC) Tom Frieden (R) speaks during a discussion on Zika, the Olympics and Global Health Security in Washington July 13, 2016. CDC on Wednesday downplayed concern that the Rio Olympics will help spread the Zika virus worldwide. (Xinhua/Bao Dandan)