Empty Streets of Shanghai Days Before City Wide Covid 19 Pandemic Lockdown in 2022

covid19 shanghai lockdown pandemic epidemic quarantine corona virus covid 19 china wuhan coronavirus disease chinese medical personnel covid healthcare workers pandemic response isolation containment measures frontline workers public health crisis protective gear testing site health professionals virus outbreak isolation facility epidemic control health workers respiratory illness infection prevention medical emergency crisis management healthcare support medical response patient care critical situation virus containment disease outbreak emergency response quarantine measures healthcare facility contagious disease virus corona outbreak health worker community compound supervised