Vaccine distribution in the second phase should be decided by age because prioritising teaching or other occupations would slow down the rollout, a leading government adviser has said. Prof Anthony Harnden, the deputy chairman of the joint committee on vaccination and immunisation (JCVI), said there "isn't a strong scientific argument" to immunise teachers, telling MPs on the science and technology committee that workers in meat processing factories would have a better case to jump the queue. Prof Harnden said deviating from the age-based approach at all could lead to "harm" by slowing down the overall number of doses administered each day. The committee has submitted its recommendations to ministers, who are expected to make a final decision on the second stage of the rollout in the coming days. All adults aged 50 and above, as well as patients of all ages over 16 with underlying health conditions, are expected to have been offered a first vaccine dose by the end of April.