The free St. Johns County/Flagler Health+ COVID-19 testing site at Flagler Hospital will be closed Friday, Dec. 25, in observance of the Christmas holiday. The site will reopen for testing from 7 to 11 a.m. Monday, Dec. 28, and Wednesday, Dec. 30. The site will conclude all COVID-19 tests at 11 a.m. Dec. 30, as St. Johns County and Flagler Health+ transition COVID-19 response operations from…