A longer gap between first and second doses of the Pfizer-BioNTech Covid vaccine makes the body’s immune system produce more infection-fighting antibodies, UK researchers have found. Experts say the findings support the UK’s decision on extending dosing intervals from the initial recommendation of three weeks. An eight-week gap seems to be the sweet spot for tackling the Delta variant. The UK initially extended the dosing gap to 12 weeks at the end of 2020. But as the vaccination programme has been rolled out through the age groups – everyone over 18 has now been offered at least their first jab – people have been encouraged to bring their second jab forward and get it after eight weeks.(BBC)…[+]