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May 5, 2015

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This file photo provided by the National Institute for Allergy and Infectious Diseases shows a colorized transmission of the MERS coronavirus that emerged in 2012.

National Institute for Allergy and Infectious Diseases via The Canadian Press / AP

This file photo provided by the National Institute for Allergy and Infectious Diseases shows a colorized transmission of the MERS coronavirus that emerged in 2012.