Prognosis
Delta Spread in Vaccinated People on Cape Cod, CDC Says
- Outbreak study contributed to CDC’s reversal on mask guidance
- Four out of five with breakthrough infections had symptoms
Tourists on Commercial Street in Provincetown, Massachusetts, on July 20.
Photographer: Barry Chin/Boston Globe/Getty ImagesThis article is for subscribers only.
The delta strain spread widely in a series of densely packed summer events and large public gatherings in Cape Cod’s Barnstable County in early July, raising further concerns about the highly transmissible variant.
The findings show just how difficult the strain will be to control as Americans return to normal activities including parties and big gatherings. In July, 469 cases of Covid, primarily caused by delta, were recorded during the Barnstable outbreak and 74% of the cases occurred in fully vaccinated individuals, the Centers for Disease Control and Prevention said Friday in a study.