South Korean elementary school students wear masks as a precaution against the MERS, Middle East Respiratory Syndrome, virus as they go to school in Seoul, South Korea, Wednesday, June 10, 2015. South Korea believes its MERS virus outbreak may have peaked, and experts say the next several days will be critical to determining whether the government's belated efforts have successfully stymied a disease that has killed seven people and infected nearly 100 in the country.(AP Photo/Ahn Young-joon)
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