The Covid-19 Outbreak: The Issue Of Face Masks

We appreciate Wang Q et al have reported the role of masks/respirator protection against COVID-19.1 However, with the progress of COVID-19 epidemic, as of April 1, 2020, a total of 75948 cases have been confirmed by World Health Organization, and 36571 deaths have been declared. Face masks can prevent human-to-human airway transmission of such infections effectively,2,3 Thus, Asian countries such as China, South Korea and Japan encourage the public to wear face masks in public areas. China