Most coronavirus cases are spread by people without symptoms, CDC now says [View all]
Source: CNN
(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.
It's one of the main reasons mask use is so important, the CDC said.
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According to the CDC, 24% of people who transmit the virus to others never develop symptoms and another 35% were pre-symptomatic. It also said 41% infected others while experiencing symptoms.
Peak infectiousness comes five days after infection, the agency said on the website. "With these assumptions, 59% of infections would be transmitted when no symptoms are present but could range (from) 51%-70% if the fraction of asymptomatic infections were 24%-30% and peak infectiousness ranged 4-6 days."
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The CDC said studies have shown 40-45% of infected people never develop symptoms.
Read more: https://www.cnn.com/2020/11/20/health/cdc-coronavirus-spread-asymptomatic-website-wellness/index.html
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