U.S. CDC says in full outbreak mode in response to Zika

By Julie Steenhuysen CHICAGO (Reuters) - U.S. disease detectives have moved into full outbreak mode over the Zika virus, assembling a team of hundreds of experts to try to better understand its impact as it spreads in the Americas.     On Sunday, the U.S. Centers for Disease Control and Prevention dedicated an emergency operations center staffed around the clock to address Zika, a mosquito-borne virus linked to severe birth defects in thousands of babies in Brazil, agency official