Health workers wear PPE suits standing vigilant outside a building placed under lockdown after a large number of residents tested Covid-19 Coronavirus positive

coronavirus virus vaccine variant pcr test testing resident patient sickness covid19 healthcare protection safety pandemic positive cases policy positive restrictions lockdown quarantine wave control illness residents face mask mask queue line covid china chinese patients china lockdown chinese testing virus spread pandemic wave chinese citizens virus control pandemic test covid variant mass testing spreading series covid positive covid test coronavirus risk health workers vigilant ppe suit lockdown area quarantine area