The booster doses are being offered to millions of vulnerable people who were in the priority groups for the main vaccination programme, following advice from the Joint Committee on Vaccination and Immunisation (JCVI).
Everyone aged 50 and over will be eligible for the jab, along with frontline health and social care workers and those aged between 16 and 49 with an underlying health condition that puts them at greater risk from Covid-19.
People will be invited to book their booster appointment at least six months after they have had their second coronavirus jab.
The rollout comes amid fears of an uncertain winter which will see Covid-19 and flu circulating at the same time, with research showing that there is an increased risk of hospitalisation and death if you fall ill with both.
UK Health Security Agency chief executive Dr Jenny Harries said this year’s flu could be a “multi-strain” and warned that natural immunity is lower after last year’s lockdown saw fewer infections than an average winter.
Dr Harries added that getting both the booster and flu jab when offered is the best form of protection this winter as it could help to protect against serious illness.
If you are among the groups eligible for the Covid-19 booster, you will be offered either a full dose of the Pfizer vaccine or a half dose of the Moderna vaccine, regardless of which vaccine you received the first time.
Much like the previous doses, it is normal to experience some side effects after your vaccine and symptoms can vary from person to person.
Listed are the most common side effects associated with the Pfizer and Moderna vaccines and how long symptoms usually last.