All adults should have been offered a jab - but one-in-four adults under 30 remain unvaccinated.
She said some people in the age group had "a lot of other things on their minds".
She said some younger people think they do not need a vaccine because they were young and well, but that did not mean they were safe from Covid. "But actually, what's more important and what people I don't think have focused on as well, is long Covid, which is just as common in young people as in middle-aged and older people.
The higher case rates among the under-25s has been driving the rates in those local authority areas where they are highest.
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