Fully vaccinated travellers from any country can now book holidays to tourism haven Phuket, the Thai government has announced, under tweaks to a struggling quarantine-free travel scheme.

Thailand's tourism industry has been on its knees, with the coronavirus pandemic and related restrictions slashing visitor numbers from 40 million in 2019 to a mere trickle over the last two years, AFP reports.

Pre-virus, the sector made up a fifth of Thailand's national income, and the travel curbs have fed into the country's worst economic performance in more than two decades.

Foreign Ministry spokesman Tanee Sangrat said unvaccinated children would be able to travel with their vaccinated parents.