Morning Rounds: Zika scare, curbing sugar, and "morning person" DNA

Florida Gov. Rick Scott declared a health emergency in his state over the moquito-borne Zika virus, following confirmation of a sexually transmitted Zika case in the U.S. CBS News contributors Dr. Holly Phillips and Dr. Tara Narula join "CBS This Morning: Saturday" to address concerns of a possible outbreak. Also, they discuss a new poll that found many Americans are working to curb their sugar intake and a study that uncovered your DNA may be associated with being a "morning person."