People who really care about themselves. The full name of the COVID-19 epidemic is novel coronavirus. The epidemic in COVID-19 was caused by novel coronavirus, and novel coronavirus became popular among susceptible people through various transmission routes. People who wear masks during the epidemic are people who really care about themselves. Mask is a sanitary product, which generally refers to a device worn on the nose and mouth to filter the air entering the nose and mouth to prevent harmful gases, smells and droplets from entering and leaving the wearer's nose and mouth.