(CNN) Most coronavirus infections are spread by people who have no symptoms, the US Centers for Disease Control and Prevention said in newly updated guidance. "Most SARS-CoV-2 infections are spread by people without symptoms," the agency said in a section of its website devoted to explaining the science of how to use masks to control the spread of the virus. "CDC and others estimate that more than 50% of all infections are transmitted from people who are not exhibiting symptoms," it added in the guidance posted Friday. According to the CDC, 24% of people who transmit the virus to others never develop symptoms and another 35% were pre-symptomatic. The CDC also now said masks can help prevent people from inhaling the droplets, large and small, that carry the virus.

Source: CNN November 21, 2020 03:33 UTC