Photo by John Moore / Getty Images
Photo by John Moore / Getty Images

If one person in a household has Covid-19, there’s a good chance it’ll spread to others — and quickly.

A report from the Centers for Disease Control and Prevention, published Friday, took a close look at how the virus spread throughout people’s homes.

The study included 101 households in Nashville, Tennessee, and Marshfield, Wisconsin. All households had one index patient — a confirmed case of Covid-19. At the time the index patient first reported symptoms, no one else in their household reported any.

The 101 index patients (each in their own household) lived with a total of 191 household contacts, 102 of whom — or 53 percent — went on to test positive for Covid-19, according to the report.

What’s more, the spread occurred “rapidly,” the authors wrote: “Approximately 75 percent of infections [were] identified within 5 days of the index patient’s illness onset.”

The report noted that the age of the index patient didn’t matter — adults, children and teens all spread the virus to others in their households.

For the full story, visit NBCNews.com/Health/News.

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