Boris Johnson is fighting to get schools open before Easter amid growing concerns over the damage being done to a generation of children by the third coronavirus lockdown. Government sources said on Monday night that mid-March is now viewed by ministers as the target deadline by which to reopen schools. Confirmation is expected this week that hopes of children returning to the classroom after the February half-term break will not be met. Labour will table an urgent question in the Commons on Tuesday to demand answers on the Government's plan. Public Health England said there was a “strong case” for primary schools to restart after half-term if cases continue to fall. During the autumn term, outbreaks were detected in just 3 per cent of primary schools, with most cases recorded in teachers, not pupils, PHE found. It comes as a further six Tory MPs on Monday joined the campaign group UsforThem, which calls for schools to fully reopen or for ministers to quantify the harms and benefits of the schools shutdown, taking the total number of Conservatives opposing the prolonged closures to 17. Jonathan Gullis, a former teacher who was among the new additions, said: "The attainment gap between disadvantaged pupils and their peers will undo the hard work of the past 10 years and widen it yet further, and set the levelling-up agenda back." Meanwhile, Robert Halfon, the Tory chairman of the Commons education committee, has written to the joint committee on vaccination and immunisation (JCVI), urging it to consider teachers as a top priority for jabs in a bid to get schools open. The letter, seen by The Telegraph, has been signed by 10 other MPs, including the former health minister Steve Brine. The latest Covid figures show that case rates are down in every region, with most now at their lowest since before the start of the year. Some regions, such as London, are at a lower rate than in December, when schools were open. The daily case number on Monday was 22,195 – a significant fall on recent days.