People over the age of 12 with severely weakened immune systems should have a third vaccine dose to top up protection against Covid-19, experts say.

About 400,000 to 500,000 in the UK are eligible and will be contacted soon.They include those with blood cancer, advanced HIV and recent organ or stem-cell transplants.

The Joint Committee on Vaccination and Immunisation (JCVI) said a separate booster programme for other age groups was still being considered. Source : BBC