Enlarge / This photo taken on November 22, 2020, shows health workers in protective suits waiting to conduct COVID-19 coronavirus tests on staff at Pudong Airport in Shanghai. (credit: Getty | STR) Nearly 18,000 workers were sealed into Shanghai’s main airport Sunday and tested for COVID-19 in one night after authorities detected seven cases linked to the cargo unit of the facility. Social media lit up with dramatic smartphone videos showing large crowds of workers pushing against guards in white hazmat suits in the airport’s parking structure. By Monday morning, local authorities grabbed hold of the situations, tweeting out videos of the 17,719 workers in orderly lines waiting to get tested, with calm piano music playing in the background.