By Jennifer Rigby LONDON (Reuters) – A booster dose of vaccine against COVID-19 continues to provide robust protection against hospitalisation for older people nearly four months after getting the third dose, new data from the UK’s Health Security Agency on Thursday showed. Vaccine effectiveness against hospitalisation for people aged over 65, 15 weeks after a booster, was 85%, down from 91% two weeks after getting the third dose, the latest vaccine surveillance report from the agency estimated. The data is the first released by the UK on the longer term durability of boosters. The UK is admin…