Ambulances are seen parked outside a building placed under lockdown at a public housing complex after a large number of residents tested positive

impact medical system healthcare system hospitalization health system health insurance sickness chinese patients covid coronavirus virus variant covid19 healthcare pandemic positive cases illness covid china china lockdown chinese testing virus spread pandemic wave chinese citizens virus control covid variant series medical staff intensive care chinese patient vulnerability urgency ambulance emergency testing protection safety policy restrictions lockdown quarantine pandemic test spreading covid test coronavirus risk health workers citizen test coronavirus spread coronavirus emergency ambulance line ambulance parked