U.S. President Barack Obama expresses optimism on the possibilities for a vaccine against Zika. Rough Cut (no reporter narration).
ROUGH CUT (NO REPORTER NARRATION) STORY: U.S. President Barack Obama expressed optimism on Thursday about the possibilities for a vaccine against Zika, a virus he said turned out to be not especially complicated. "We just had a meeting about Zika, where we actually think there's a promising pathway for diagnostics and vaccines on this," Obama said during a panel discussion about precision medicine. "It's not a real complicated virus, apparently."