Symptomatic Covid-19 patients are more contagious than asymptomatic people, new study finds

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A new study has found that people infected with Covid-19 are more likely to spread the virus to close contacts two days before the onset of symptoms to three days after symptoms appear.

The study, published in the journal JAMA Internal Medicine, also found that the risk of transmission is highest in people who experience mild and moderate versions of the virus.

The researchers enrolled 730 patients, who had a positive Covid-19 diagnosis, and 8 852 of their close contacts. They identified these patients from the provincial Centre for Disease Control and Prevention in China, from January to August 2020.

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