FILE -- In this Tuesday May, 13, 2014 file photo, Muslim pilgrims wear surgical masks to help prevent infection from a respiratory virus known as the Middle East Respiratory Syndrome (MERS) in the ... more 
FILE -- In this Tuesday May, 13, 2014 file photo, Muslim pilgrims wear surgical masks to help prevent infection from a respiratory virus known as the Middle East Respiratory Syndrome (MERS) in the holy city of Mecca, Saudi Arabia. Saudi, which is grappling to contain the spread of a frequently deadly respiratory virus, announced Tuesday, June 3, 2014 that a review of the illness led authorities to sharply revise upward the number of confirmed infections and deaths from the disease. A report by the official Saudi Press Agency said authorities have registered a total of 688 confirmed infections and 282 deaths as a result of MERS since the virus was first identified in 2012. (AP Photo/Hasan Jamali, File) less 
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Associated Press | Photo By Hasan Jamali, File
Tue, Jun 3, 2014 1:00 PM EDT