This May 14, 2014 image, provided by Denver International Airport, shows newly-erected signs warning travelers about he danger of the MERS virus, at Denver International Airport. MERS, or Middle East Respiratory Syndrome, is a respiratory illness that begins with flu-like fever and cough but can lead to shortness of breath, pneumonia and death. The airport says the signs were posted Wednesday, May 14, 2014 at all of its screening areas at the direction of the Centers for Disease Control. (AP Photo/Denver International Airport)
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