NHS staff in England and Wales have begun receiving booster jabs as part of plans to increase protection for millions of people this winter. Over-50s, care workers and younger adults with certain health conditions across the UK will also be offered a third vaccine dose, at least six months after their second jab. People will be contacted when it’s their turn to received one dose of Pfizer or a half dose of Moderna. Catherine Cargill, a maternity support worker and student at Croydon University Hospital, said she was excited to get the booster. “So far I haven’t caught Covid and I want to keep it that way,” she said.