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SEOUL, SOUTH KOREA - JUNE 02: People wear masks as a precaution against the MERS virus on June 2, 2015 in Seoul, South Korea. The Ministry of Health and Welfare of South Korea confirmed two deaths from Middle East Respiratory Syndrome (MERS) on June 2, 2015. It reported six new cases of MERS, raising the number of confirmed local patients to 25. The first case was confirmed on May 20. (Photo by Chung Sung-Jun/Getty Images)

SEOUL, SOUTH KOREA - JUNE 02:  People wear masks as a precaution against the MERS virus on June 2, 2015 in Seoul, South Korea. The Ministry of Health and Welfare of South Korea confirmed two deaths from Middle East Respiratory Syndrome (MERS) on June 2, 2015. It reported six new cases of MERS, raising the number of confirmed local patients to 25. The first case was confirmed on May 20.  (Photo by Chung Sung-Jun/Getty Images)