First identified in humans in 2012, MERS is caused by a coronavirus from the same family as the one that triggered China's deadly 2003 outbreak of Severe Acute Respiratory Syndrome (SARS). There is no cure or vaccine.
"The virus appears to be circulating widely throughout the Arabian Peninsula," the World Health Organization (WHO) said on its website. "All recent cases that have been reported outside the Middle East first developed infection in the Middle East."
WHO said on Friday 10 people in Korea were confirmed as having MERS, but there had been no sustained human-to-human spread. The UN agency said that it was not recommending screening of passengers or that travel or trade restrictions be imposed on South Korea due to the outbreak.
"The virus is not behaving differently. It is direct transmission and not sustained human-to-human-transmission. They are all related to the same case who came traveling from the Middle East," WHO spokesman Christian Lindmeier told a briefing in Geneva.
The patient, in isolation in hospital in the southern Chinese city of Huizhou, had a fever and a chest examination showed possible pneumonia, China's National Health and Family Planning Commission said.
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