Offer sympathy and reassurance to ease fears. Maybe even shop and collect their medication for those in isolation.
Baffled about boosters?
A common argument against COVID-19 vaccination is “Surely the vaccines can’t be effective if I require a booster?”
All vaccines work to train the immune system to recognise foreign invaders and produce antibodies that will attack them. But the strength of the initial immune response, and the amount of time the antibodies will last, varies depending on both the pathogen the vaccine is fighting, and the vaccine itself.