New guidance by the Centres for Disease Control and Prevention estimates that 40 percent of people infected with COVID-19 are asymptomatic and the chance of transmission from people with no symptoms is 75 percent.

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In updated guidance also reported by CNN, the agency expanded its "current best estimate" based on data from late last month to raise the rate of people infected with COVID-19 who are asymptomatic from 35 percent, which was reported in late May, to 40 percent.

The agency previously estimated that the chance of transmission of the virus from asymptomatic people was 100 percent, CNN reported.