Ontario schools to remain closed to in-person learning until September According to the health unit, there are 4,320 youth-only appointments available through clinics in all three regions served by the health unit.Youths can also book appointments through pharmacies and primary health-care providers, the health unit stated in an email.The youth-specific clinics are part of a strategy by the health unit to get more shots into arms for that age group during the summer.“This will ensure they receive their first dose of vaccine to allow them to receive their second dose at least two weeks before school starts in September or the end of August,” Dr.