Public health officials say masks can prevent wearers, whether or not they're expressing symptoms of COVID-19, from spreading the virus to others.
Share on Pinterest Ndị ọkachamara na-ekwu na ụfọdụ N95 masks na n'ihu valves na-echebe onye ọrụ ma anaghị egbochi onye ahụ ịgbasa COVID-19 na ndị ọzọ nọ nso.