Maryland will open its fourth mass vaccination site in March, Gov. Larry Hogan announced on Tuesday.

Hogan also said that the state was increasing its tracking of variants of the coronavirus, and was expecting imminent distribution of a new single-dose Johnson & Johnson vaccine.

The fourth mass vaccination site, supported by FEMA, will be operating by March 11 in Charles County. FEMA will provide more than 100 personnel to inject vaccines and provide other support, the governor said in an announcement.

The state has already opened mass vaccination sites at the Baltimore Convention Center and at Six Flags America in Prince George’s County, with a third site at M & T Bank Stadium in Baltimore opening this week.

However, vaccine availability at all locations has been hampered by limited national supply, a situation not expected to ease soon.

But Hogan on Tuesday said that he has been notified that the state could expect to begin receiving a third type of vaccine — the Johnson & Johnson single-dose variety — as early as next week. The addition of a third vaccine type would significantly expand the state’s vaccination abilities.

Also on Tuesday, Hogan:

  • clarified that pupils in re-opening public schools are expected to wear masks in all settings where they may come in contact with others, including classrooms, hallways, cafeterias, auditoriums, and gymnasiums.
  • announced that the state has entered into agreements with the University of Maryland, Baltimore and Johns Hopkins University to more than double the state’s surveillance of coronavirus variants to screen more than 10% of cases—the level recommended by public health experts.