I understand that but many of those that have received their jabs won't have gained immunity by 22 February as they won't have had time for their resistance to COVID to build up which is normally 3-4 weeks after their first jab. I believe that is one of the main reasons why scientists in England recommended school returns from 8 March. However if there are sound scientific reasons for returning earlier in Wales then so be it as long as the WG are not following a strategy of simply wanting to be different to England in order to emphasise their independence.