The Tennessee Department of Health has opened up the next phase of its COVID-19 Vaccination Plan.

As of March 22, the majority of counties across the state have begun vaccinating residents in Phases 2A and 2B, which include those who work in critical infrastructure, social services, commercial food production, public transit and telecommunications.

The state has also moved to begin vaccinating residents age 55 and older, according to the TDH.

While most counties, including Williamson, have moved to the next phase, major counties such as Davidson and Shelby remain in Phase 1C as they operate under the guidance of their own health departments. Additionally, Madison County has opened vaccines to Phase 3, which includes those in congregate living facilities and grocery workers.

See the phases for each county here.