People eligible for the spring Covid booster have been urged to get vaccinated by a leading NHS medic.
Professor Sir Stephen Powis, NHS England Medical Director, has warned that those who have yet to act on an invitation should do so as soon as they can in order to protect the most vulnerable.
The NHS has invited more than five million people for the spring booster and around a fifth have yet to be jabbed.
People at high risk from Covid have been offered a spring booster dose to increase their levels of protection.
Since March 21, those 75 and over, care home residents, and immunosuppressed people have been able to get their spring booster.
Anyone eligible will still be able to come forward after June and have a discussion with a healthcare professional around the timing of a possible autumn dose - likely to be three months from their last, Wales Online reported.
Uptake of the spring booster in Scotland has been encouraged by Public Health Scotland.
On June 19, Health Secretary Humza Yousaf said 90 percent of over-90s and two thirds of those who are aged over 12 and are immunosuppressed have taken up the offer.
Spring booster jab appointments can be booked online on the NHS website here.
Eligible people can also attend a walk-in vaccination site or phone the national vaccination helpline number on 0800 030 8013.
Regarding spring booster rates, Prof Powis said: "The recent rise in Covid infection levels in England acts as a timely reminder that it is crucial those who are eligible come forward for their spring jab and get themselves protected.
"Well over four in five people aged 75 and over have come forward for a spring booster so far and I would urge anyone who hasn't to get their spring jab as soon as possible."
Almost 250,000 reminders will be sent out to those eligible before the end of the month via text message, email or letter.
He added that the spring booster will allow people to get another vaccine in autumn that will maximise their protection over winter.
"The spring dose will not only give you and your loved ones protection this summer amid rising infection levels, but also allow you to get a vaccine this autumn at the right time to maximise your protection over winter. This is particularly important for people who are immunosuppressed."
The NHS will also continue to offer the vaccine at local sites to those who are newly immunosuppressed.
More than four million people and around 86 percent of those aged 75 and over have already had their spring dose.
Those who are eligible include older adult care home residents, people aged 75 and over and those who are immunosuppressed.
The NHS is beginning preparations for an autumn rollout ahead of the green light from the UK Government and the JCVI.
Gemma Peters, chief executive of Blood Cancer UK, said: "It's good to see NHS vaccine team efforts to ensure people get the vaccine doses they are entitled to. Immunocompromised people are at higher risk from Covid, and the single simplest way of increasing their protection level is to make sure they've had the vaccine doses they are due.
"If you're immunocompromised, have had fewer than five doses and haven't had one in the last three months, you should be getting another one right now, unless your doctor has told you not to.
"We know that lots of immunocompromised people have not yet had all the right number of vaccine doses, and so don't yet have the level of protection they should, and that this is particularly evident in the Bangladeshi, Pakistani, Black African and Black Caribbean communities.
"I urge every immunocompromised person who is due another dose to book it today. With the Covid rate high at the moment and immunocompromised people continuing to die of it, it could be a decision that literally saves your life."
