Schools are back open in Palm Beach County and employees, vendors and visitors are being required to wear face coverings.The school district has reinstated its mask requirement effective today as staff returns to work.In a letter, the district "strongly encourages" students to wear facial coverings when they return to class tomorrow, but notes that it recognizes that decision under Florida law rests solely with parents.A rise in community transmission of COVID-19 brought on by the Omicron variant is cited for the need to bring back the masks