FILE -- In this Tuesday May, 13, 2014 file photo, Muslim pilgrims wear surgical masks to prevent infection from respiratory virus known as the Middle East respiratory syndrome (MERS) in the holy city

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FILE -- In this Tuesday May, 13, 2014 file photo, Muslim pilgrims wear surgical masks to prevent infection from 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)

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Associated Press
Tue, Jun 3, 2014 7:25 PM EDT