A police officer stands guard outside a public housing building placed under forced lockdown after a large number of residents tested Covid-19 Coronavirus positive

ambulance background ambulance coronavirus virus vaccine variant testing resident patient sickness covid19 healthcare protection safety pandemic positive cases policy positive government restrictions lockdown quarantine wave control illness residents face mask covid china china lockdown chinese testing virus spread pandemic wave virus control pandemic test covid variant spreading series covid positive covid test coronavirus risk vigilant ppe suit police officer ambulance vehicle stand guard police policing lockdown area quarantine area