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Covid-19: Asymptomatic people may be more infectious than we thought

Commuters wear protective masks as they crowd after getting off the subway during rush hour in Seoul, South Korea.

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People who have the coronavirus without developing symptoms appear to have similar levels of the virus in their noses and throats to people with mild symptoms, a study has found. However, this doesn’t necessarily mean they are as likely to spread covid-19 as those who are sick.

After much speculation early on in the pandemic, a growing body of evidence suggests people can pass on the coronavirus even if they don’t have any symptoms. But it still …