here's our health correspondent catherine burns. america has been doing it since may. more than 10 million 12— to 15—year—olds there have had a covid vaccine. other countries are, too, including canada, brazil, france, the netherlands, italy — but not the uk. regulators approved vaccines as safe and effective for this age group in the summer, but thejoint committee on vaccination and immunisation�*s job is to decide if it's necessary. its answer — not for every iz—is—year—old. for the healthy children, the risk—benefit balance is really very uncertain and very tight. normally what we do when we recommend vaccination for children is we see a very clear benefit that clearly outweighs any possible risk. and in the absence of that clear blue water, if you like, between those two, we prefer to advise that healthy children should not for the moment be immunised. covid doesn't tend to make children very sick, so the benefits