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How contagious are delta variants?

The delta variant of the virus that causes Covid-19 is often said to be highly contagious. So what does that really mean?

Scientists studying Covid-19 Increased delta infectivity This means that we need to renew our thinking about exposure risk. People infected with Delta have higher levels of the virus than their predecessors, so the old rules of thumb no longer apply, they say. It also includes the traditional knowledge that it takes 15 minutes to get in close contact with someone to get infected.

Delta has already changed its public health advice on masking.Centers for Disease Control and Prevention on Tuesday It is recommended that vaccinated people resume masking indoors In a particular region of the country.And the local authorities Revive the duty of the mask, Including Los Angeles County and St. Louis County.

CDC Director Rochelle Walensky said the guidelines have been revised as new data on the Delta variant indicate that: Breakthrough infections for fully vaccinated peopleAlthough rare, it carries the same viral load as an unvaccinated person’s infection.

This is what scientists say they need to know how Delta changes risk calculations.

How contagious are delta variants?

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