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The rollout of Covid vaccines to health 12 to 15-year-olds has begun in England.
Roll-out is also starting in Scotland and Wales this week, while in Northern Ireland the teen vaccinations are likely to be offered from October.
It is part of the drive to get more people protected ahead of winter as the pandemic continues.
Booster shots are also being offered to over 50s, vulnerable people and health and social care workers.
Teen vaccines
Jack Lane, 14, who received his vaccine in Leigh-On-Sea, Essex, said: "I am proud to have had my vaccination so that I can remain in school and continue in my education - the jab was quick, easy, and painless."
Experts say that unlike for older people, there is only a marginal benefit to vaccinating adolescents on health grounds alone given their risk of becoming seriously ill with Covid is small.
And although vaccinating secondary school-age children won't stop the virus circulating, it could help keep more pupils in class.
Some three million children are eligible for the jab across the UK after the chief medical officers of the four nations advised younger teenagers should be offered a single dose of the Pfizer vaccine.
Parental consent will not be needed if a child is considered competent to make a decision by themselves, weighing the benefits and risks, including the small chance of a very rare side effect from the vaccine.
Dr Nikki Kanani, GP and deputy lead for the NHS Covid-19 vaccination programme, said: "The vaccine is safe and effective and I would urge families to work closely with their schools based vaccination team to get their loved ones vaccinated when they are invited to protect themselves and their families ahead of the winter period."