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Spike in U.S. Zika virus cases raises concern

The CDC is now saying that the number of pregnant women with the Zika virus in the U.S. and its territories has risen to 279. President Obama urged Congress to approve emergency funding for vaccine development and other measures to combat the virus. Dr. William Schaffner, professor of preventive medicine at Vanderbilt University Medical Center joins CBSN with the latest.
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