The federally-supported COVID-19 vaccination site at Gateway Mall will stop giving first doses of the Pfizer vaccine to those 16 and up after Tuesday.

The federally-supported COVID-19 vaccination site at Gateway Mall on Sunday resumed the use of the Johnson & Johnson vaccine.

The pause in Johnson & Johnson vaccinations will continue after U.S. health advisers told the government Wednesday that they need more evidence to decide if a handful of unusual blood clots were linked to the shot -- and if so, how big the potential risk really is.

The U.S. on Tuesday recommended a pause in using the single-dose Johnson & Johnson COVID-19 vaccine to investigate unusual blood clots that occurred in six women 6 to 13 days after vaccination. Cardiologist Dr. Michael Koren, director of the Jacksonville Center for Clinical Research, has been studying this closely.

Gov. Ron DeSantis says Florida is temporarily suspending Johnson & Johnson vaccinations because a half-dozen people developed blood clots after getting the shot.

The FDA commissioner said Tuesday she expected the pause in using the Johnson & Johnson vaccine to investigate reports of blood clots to last "a matter of days."

Gateway Mall and other vaccination sites run by the federal government in Jacksonville discontinued giving Johnson & Johnson coronavirus vaccines after a joint call from the CDC and FDA. State-run sites and private pharmacies have also suspended giving J&J doses but continue with the two-shot vaccines.

Two pop-up vaccination sites in Jacksonville offered the Johnson & Johnson vaccine on Sunday.