U.S. CDC: Vaccinated people infected with Delta can spread the virus

CGTN

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A man gets a COVID-19 vaccination in Los Angeles, California, U.S., August 2, 2021. /CFP

A new study by the U.S. Centers for Disease Control and Prevention (CDC) shows that if vaccinated people get infected with the more contagious Delta variant anyway, they have as much virus in their bodies as unvaccinated people who get infected.

The study, published by the CDC on Friday, focused on 469 COVID-19 cases identified among Massachusetts residents who had traveled to Barnstable County, a summer vacation destination, during July 3 to 17.

A total of 346 cases, about 74 percent, occurred in fully vaccinated people, according to the study.

Testing identified the Delta variant in 90 percent of specimens from 133 patients.

The study demonstrated that Delta infection resulted in similarly high SARS-CoV-2 viral loads in vaccinated and unvaccinated people, said CDC Director Rochelle Walensky.

"High viral loads suggest an increased risk of transmission and raised concern that, unlike with other variants, vaccinated people infected with Delta can transmit the virus," she said.

"I think people need to understand that we're not crying wolf here. This is serious," Walensky told CNN.

"It's one of the most transmissible viruses we know about. Measles, chickenpox, this – they're all up there."

Walensky said this finding was a pivotal discovery leading to CDC's updated mask recommendation.

The CDC updated its masking recommendation on Tuesday, urging vaccinated Americans to resume wearing masks in schools and in public indoor spaces in COVID-19 hot spots across the country.

"The masking recommendation was updated to ensure the vaccinated public would not unknowingly transmit virus to others, including their unvaccinated or immunocompromised loved ones," she said.

The CDC suggested jurisdictions to consider expanded prevention strategies, including universal masking in indoor public settings, particularly for large public gatherings that include travelers from many areas with differing levels of SARS-CoV-2 transmission.

The good news is vaccinated people are safer, according to the CDC, as vaccines prevent more than 90 percent of severe disease.

(With input from Xinhua)