Outbreak of SARS-CoV-2 Infections, Including COVID-19 Vaccine Breakthrough Infections, Associated with Large Public Gatherings — Barnstable County, Massachusetts, July 2021
https://www.documentcloud.org/documents/21030483-outbreak-of-sars-cov-2-infections-including-covid-19-vaccine-breakthrough-infections-associated-with-large-public-gatherings-massachusetts-july-30-2021