An additional booster dose will be offered to all adults over-75 and the most vulnerable over-12s in the Isle of Man in the coming weeks.
The UK's vaccines advisers said an extra dose would help top up their protection against severe Covid-19.
Up until now, only people with severely weakened immune systems had been eligible for a fourth dose - three doses plus a booster.
Those now being offered a second booster, to be administered six months after their previous dose, are:
- Adults aged 75 years and over
- Residents in a care home for older adults
- Individuals aged 12 years and over who are immunosuppressed, or have weakened immune systems
The Manx government said the extra dose should be offered no earlier than 24 weeks after their initial booster dose of the vaccine.
A spokesman added:"Timings will be confirmed when final guidance is published and further information on the rollout will be provided soon.
"Please do not contact 111 in the meantime".
Douglas church becomes House of Dog
Manx mums relate to Paris's school holidays feelings
Okells makes it a double at beer awards
Organisers call off 11-hour music event next weekend
Plans lodged for quayside hotel and apartments in Peel
£5,000 fundraiser launched for Buddy's surgery
Cruise ship makes Island stopoff
Parents warned over school run parking and driving