The Delta variant is finding clusters of unvaccinated people even in some of the best-vaccinated parts of the country, such as Maine. A Covid-19 surge in the New England state has filled hospitals and put dozens of mostly unvaccinated people on ventilators, setting records for the state.
The problem, public-health experts say, is the variant’s high transmissibility combined with the relaxation of precautions such as wearing masks. Covid-19 infections and hospitalizations have also flared among mostly unvaccinated people in Vermont and western Massachusetts, highlighting the risk Delta poses even in states with the best track records for getting shots in arms.