Household spread of Covid-19 is common and quick, a new CDC study finds

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(CNN)The spread of Covid-19 among members in a household after one person is infected is "common" and occurs quickly after illness onset, according to a new study from the US Centers for Disease Control and Prevention.

The person exposed or suspected of having Covid-19 should be isolated before getting tested and before test results come back to protect others in the home, said the study, published Friday in the CDC's Morbidity and Mortality Weekly Report.

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