Before revision: Background : Laboratory diagnosis of the novel coronavirus (SARS-CoV-2) infection combined with tracing/ quarantine for contacts of infected individuals affects the spread of SARS-CoV-2 and the  levels of related mortality.
After revision: Background : Laboratory diagnosis of the novel coronavirus (SARS-CoV-2) infection combined with tracing/ quarantine for contacts of infected individuals affects the spread of SARS-CoV-2 and the SARS-CoV-2 infection and levels of related mortality.