This handout photo taken on March 4, 2020 and received on March 5 from Korean Air shows a worker checking his protective gear as he prepares to spray disinfectant on an airplane as part of preventive measures against the spread of the COVID-19 coronavirus, at Incheon International Airport in Incheon. – South Korea’s total number of COVID-19 coronavirus cases — the largest outside China, where the disease first emerged — approached 6,000 on March 5 as authorities announced a ban on face mask exports. (Photo by Handout / Korean Air / AFP) / RESTRICTED TO EDITORIAL USE – MANDATORY CREDIT “AFP PHOTO / KOREAN AIR” – NO MARKETING NO ADVERTISING CAMPAIGNS – DISTRIBUTED AS A SERVICE TO CLIENTS — NO ARCHIVE — (Photo by HANDOUT/Korean Air/AFP via Getty Images)