Chinese frontline doctor Peng Zhiyong, chair of Critical Care Medicine (CCM) at Zhongnan Hospital of Wuhan University, and his team shared their experience treating COVID-19 patients with Israeli medics via a conference call on Monday during a live broadcast of "COVID-19 Frontline." When asked about the length of medical quarantine for recovered COVID-19 patients, Yang Xiao, CCM physician of Zhongnan Hospital of Wuhan University, said patients should have at least  a 14-day quarantine. Doctor Hu Bo added that they usually do five PCR (polymerase chain reaction) tests for recovered COVID-19 patients to be sure.