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Dr. Gupta: What you need to know about Hantavirus

CNN has learned the CDC is classifying its response to the deadly hantavirus outbreak as level 3, its lowest emergency level. What do you need to know about the virus now being monitored in multiple countries? CNN News Central's John Berman gets answers from CNN Chief Medical Correspondent Dr. Sanjay Gupta.

3:20 • Source: CNN
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