virgin islands -- (thomas r. frieden, m.d., director, centers for disease control and prevention) we may well see tens or hundreds of thousands of zika infections in puerto rico. directors frieden and fauci said researchers are already working on a vaccine. (anthony fauci, m.d., director, national institute of allergy and infectious diseases) we will likely go into phase one clinical trial after several months we'll know if it's safe and they reiterated the warnings for pregnant women (thomas r. frieden, m.d., director, centers for disease control and prevention) right now the most important thing for americans to know is, if you're pregnant it's better not to travel to a place where zika is spreading and if you're pregnant in a place where zika is spreading, do everything you can to protect yourself against mosquito bites. there are currently more than 50 cases of zika in the u.s. and more are expected but f said a massive zika outbreak in the u.s. is unlikely. in washington, i'm steve nannes. the zika virus is ed for b