Today, the latest on the fast-spreading Zika virus. Once just a Latin American health problem, the mosquito-borne disease has become a global health emergency, with dozens of cases reported across the US, including several in DC and Virginia and on Thursday, the first reported case in Maryland. Baltimore City Health Commissioner Dr. Leana Wen sits down with Nathan Sterner to tell us what’s known about the Zika virus, and what steps the city is taking to counter this emerging public health threat.