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Workers wearing protective gears spray disinfectant as a precaution against the new coronavirus at Korean Air's Incheon Operation Center at Yeongjong Island, South Korea, Tuesday, Feb. 25, 2020. China and South Korea on Tuesday reported more cases of a new viral illness that has been concentrated in North Asia but is causing global worry as clusters grow in the Middle East and Europe. (Choe Jae-koo/Yonhap via AP)