Jabs for 12 - 15 year olds and boosters for the over-50s have been given the go-ahead in Wales.
Everyone over the age of 50 will be offered a third dose, alongside all frontline health and social care staff and all those with underlying health conditions.
Both programme will start next week, with boosters given to care residents, staff and NHS staff first.
Young teenagers will be offered one dose of the Pfizer-BioNTech vaccine.
The decision follows recommendations from the UK's four medial advisors that it will help reduce disruption within schools.
It will be up to children and parents whether they decide to take up the vaccines.
Health Minister Eluned Morgan said the NHS is ready to deliver boosters and will start next week for people living and working in care homes, and frontline health and social care staff.
It will then be offered to everyone over 50, she told a press conference.
Ms Morgan said jabs for 12-15 year olds will be carried out in mass vaccination centres and "some" schools.
It would be up to health boards to work with local authorities "to determine how that will happen", she said.
Separately she expressed concerns over pregnant women not coming forward for Covid vaccinations, urging them to speak to their midwife for advice.