A family member (60, designated CEV in Covid and shielded) went for their booster jab today, only to be told that it was a third jab and they would have their booster on 6 months. All good.
But another family member, nearly 90, had their booster a few weeks ago. No suggestion of a third vaccine. They have the same condition as the younger family member, but other health conditions as well. Also designated CEV in Covid times and shielded.
I know eligibility for the third vaccination is to do with immuno responses, but does anyone know what might be the reason one is having 3 + booster, and the other 2 + booster?