CDC: Vaccinated Can Still Spread Delta Varient

July 30 (UPI) -- The Centers for Disease Control and Prevention on Friday released data showing that vaccinated people are at increased risk for COVID-19 infection with the Delta variant and that they can spread the disease nearly as easily as unvaccinated people.
Nearly 75 Percent of COVID-19 cases connected with large gatherings on Cape Cod in Massachusetts occurred in people fully vaccinated against the virus, according to data published Friday by the CDC.
The new data comes after the agency issued guidance on Tuesday recommending that everyone, including those who are fully vaccinated, wear masks in indoor public settings in areas where COVID-19 transmission is high.
An internal memo circulated at the CDC this week warned that the Delta variant of the coronavirus is significantly more transmissable than previously known and is as contagious as chickenpox.
CDC urges vaccinated people in high-COVID-19 areas to wear masks indoors
"Delta infection resulted in similarly high [COVID-19] viral loads in vaccinated and unvaccinated people," CDC director Dr. Rochelle P. Walensky said Friday in a statement.
"High viral loads suggest an increased risk of transmission and raised concern that, unlike with other variants, vaccinated people with Delta can transmit the virus," Walensky said.
In samples tested for a COVID-19 variant, 90 percent were identified as the Delta variant of the coronavirus, which is thought to be more contagious and less susceptible to vaccines, the agency said.
Just under 80 percent of those infected experienced symptoms of the virus and five of the 462 cases reported as part of the outbreak required hospital treatment, the CDC said.
These findings are "concerning and [were] a pivotal discovery leading to CDC's updated mask recommendation," Walensky said.
"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.
However, in an internal memo, first reported by the New York Times and Washington Post on Thursday and confirmed Friday by UPI with a CDC spokeswoman, researchers with the agency suggest that even these new recommendations may not go far enough.
The memo describes "universal masking" as "essential" in stemming the spread of the Delta variant.