Hartford HealthCare mass vaccination sites close permanently today, officials announced.

The vaccination clinic at Sacred Heart University's West Campus has seen a dramatic decrease in demand for the shot. Hartford HealthCare has been operating several mass vaccinations sites across the state, including the one at the Atrium since the end of December.

The health care system just hit the milestone of 500,000 doses administered.

However, officials say while their mega sites are closing, their work isn't done.

In addition to the site at Sacred Heart University's West Campus, the gym inside Central High School has served as a mega clinic, and it too will be closing.

Hartford HealthCare says it has administered more than 58,000 shots between those two locations. Officials say the sites went from doing over 4,600 appointments a week to about 200.

Community Health Center recently announced the closure of its mass vaccination sites across Connecticut.

Hartford HealthCare says it will be shifting to community-based efforts by running micro-sites instead, going directly to where the people who need a shot are.

Five local Hartford HealthCare urgent care centers will also administer the vaccine starting next month.

The emergency department as well as the outpatient pharmacy at St. Vincent's Medical Center will continue to vaccinate people.

Instead, Hartford HealthCare says it will focus on vaccinating the 18- to 25-year-old age groups in Connecticut.

They say the age has the highest confirmed cases of COVID-19 in the state and lacks the enthusiasm for the shot.

Hartford HealthCare plans on reaching the age group by administering the Pfizer vaccine at its urgent care centers in Fairfield, Stratford, Shelton, Trumbull and Monroe.