Vermont is one of the most vaccinated states in the country and has served as a model for its COVID-19 response throughout the pandemic. But now, the state is experiencing its worst COVID-19 surge yet, with several factors -- including its own success -- to blame, officials said. In Vermont, nearly 72% of residents are fully vaccinated against COVID-19 -- more than any other state, according to U.S. Centers for Disease Control and Prevention data. At the same time, it has the 12th-highest rate of new COVID-19 cases over the last week, state data released Tuesday shows. Vermont has seen...