A new study by the US Centers for Disease Control and Prevention shows that three-quarters of people infected with Covid-19 at public events in a county in Massachusetts have been vaccinated.
The study published on Friday showed that three-quarters of infected people were vaccinated, indicating that the Delta variant of the virus is highly contagious.
Another internal CDC document first reported by the Washington Post on Friday described the Delta variant as being as contagious as chickenpox and warned that it could cause serious illness.
The authors of the new study recommend that local health authorities consider requiring masks to be worn in indoor public places, regardless of the vaccination situation or the number of coronavirus cases in the community.
The following are the results of the research:
- The study identified 469 Covid-19 patients.
- 74% of them were fully vaccinated.
- The test found the Delta variant in 90% of the virus samples from 133 people.
The CDC says that the viral load of fully vaccinated people is similar to that of unvaccinated people.
It said that a high viral load indicates an increased risk of transmission and raises concerns that, unlike other variants, vaccinators infected with Delta can transmit the virus.
CDC Director Rochelle Walensky said in a statement that the findings of the report are “worrisome and are the key findings that led to the CDC’s updated mask recommendations.”
On Tuesday, the CDC changed its guidelines for wearing masks, calling for the use of masks in areas with a surge in cases to prevent fully vaccinated people from spreading the virus.
Varensky said in a statement: “The masking recommendations have been updated to ensure that the vaccinated public does not unknowingly spread the virus to others, including unvaccinated or weakened relatives.”
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