LONDON (Reuters) -Britain’s vaccine advisers on Thursday said that an anticipated autumn COVID booster campaign would be aimed at people aged over 65, care home residents, frontline health and social care workers and all adults in a clinical risk group. Britain is offering a spring booster to the over-75s, care home residents and immunosuppressed people, and ministers have spoken openly of plans for a further booster campaign in the autumn. In interim advice, the Joint Committee on Vaccination and Immunisation (JCVI) stopped short of recommending another shot for all adults, though said the ad…