A tourist wearing a mask to prevent contracting Middle East Respiratory Syndrome (MERS) uses her mobile phone at Myeongdong shopping district in central Seoul, South Korea, June 10, 2015. South Korean President Park Geun-hye postponed a U.S. visit on Wednesday to supervise the handling of an outbreak of Middle East Respiratory Syndrome (MERS), as two more people died and 13 new cases were reported, lifting the total number of patients to 108. REUTERS/Kim Hong-Ji