Normal surgical masks are sufficient to guard against the (COVID-19) virus.
Chen Shih-chung Quotes
Chen Shih-chung (陳時中; Chén Shízhōng) is a politician in the Republic of China. He is the Minister of Health and Welfare since 2017.
Attribution
Quotes and notes from Wikiquote: Chen Shih-chung (page history), available under CC BY-SA 4.0.