The roll-out of COVID-19 booster vaccines will begin at the start of September to help boost the immunity of those at higher risk from COVID-19, improving their protection against severe illness and to protect the NHS over winter 2022 to 23.

Adults 18+ will be offered the Moderna vaccine which protects against both the original strain of COVID-19, and the Omicron strain.

A single dose of COVID-19 vaccine will be offered to:

residents in a care home for older adults and staff working in care homes for older adults
frontline health and social care workers
all adults aged 50 years and over
people aged five to 49 years in a clinical risk group
people aged five to 49 years who are household contacts of people with immunosuppression
people aged 16 to 49 who are carers

https://gov.wales/autumn-booster-invitations-issued-eligible-adults-wales