Weekend vaccination appointments are being reserved for children who are registered for a vaccine this week.
Parents with children aged 12 to 15 will be able to register them for a Covid-19 vaccine from Thursday.
The HSE says 89 per cent of people who are eligible for a vaccine have received their first dose.
National Lead for the COVID-19 vaccination programme Damien McCallion says appointments will be offered to parents within days of registering.
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