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[Editorial] MERS—the latest threat to global health security

The spread of Middle East respiratory syndrome (MERS) to South Korea, and now to China, is an important signal of the need for increased vigilance in global health security measures. As reported in Correspondence in this week’s issue, the rapid transmission of MERS in South Korea led to 12 laboratory-confirmed cases over a 2-week period in May, and many more cases since, with relatives, medical staff, and a fellow patient all contracting the disease, which started with one 68-year-old man who had travelled to the Middle East.