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A woman wearing a face mask walks past a lips sign advertising a sale in a shopping district in Seoul on June 11, 2015. South Korea's outbreak of the potentially deadly MERS virus on June 11 forced the central bank to cut its key interest rate to ward off greater economic damage, as retailers report a slump in business. AFP PHOTO / JUNG YEON-JE (Photo credit should read JUNG YEON-JE/AFP/Getty Images)

A woman wearing a face mask walks past a lips sign advertising a sale in a shopping district in Seoul on June 11, 2015. South Korea's outbreak of the potentially deadly MERS virus on June 11 forced the central bank to cut its key interest rate to ward off greater economic damage, as retailers report a slump in business.  AFP PHOTO / JUNG YEON-JE        (Photo credit should read JUNG YEON-JE/AFP/Getty Images)