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"I watched a line of cars back up outside Outer Cape Health Services as the health center that had been providing COVID testing and vaccinations suddenly became overwhelmed in mid-July; after I called the state, a mobile testing site was deployed nearby and by July 16 it was clear Provincetown was the epicenter of a cluster, with a majority of positives reportedly among fully vaccinated people. The center’s testing and the town’s meticulous contact-tracing effort proved vital to the CDC’s understanding of the delta variant, and local nurses, business owners, workers, residents, and visitors who participated were praised for conducting what experts called an impressive example of citizen science." - Terrence Doyle