Medical workers wearing protective gear work at a COVID-19 testing site at Toronto International Airport in Mississauga, Ontario, Canada, on Feb. 22, 2021. Starting from Monday, travelers arriving in Canada by air are required to take a COVID-19 molecular test before they exit the airport. They are also required to quarantine for three days at a government-designated hotel at their own expense until they get a result. (Photo by Zou Zheng/Xinhua)
