Millions of older and vulnerable people in England can now book their spring Covid-19 jabs.
Officials stress that previous immunity “can wane over time”, urging eligible individuals to book an appointment.
Tens of thousands of daily slots are available at GP practices and community pharmacies.
The programme is open to those aged 75 and over, older people in care homes, and individuals with weakened immune systems.
NHS England said these patients will be invited to come forward, but they do not need to wait to book an appointment.
Slots can be secured using the NHS app, or by going online, visiting a walk-in site or calling 119.
Covid-19 spreads year round and can be life-threatening to elderly or vulnerable people.
Caroline Temmink, director of vaccination at NHS England, said: “With us all experiencing lighter and warmer days, it can be harder to imagine getting sick from viruses like Covid-19, but they do circulate all year and can be just as dangerous for those who are vulnerable.
“Previous immunity can wane over time, so we are encouraging all those who are eligible to come forward as soon as possible to get protected.
“You do not need to wait for an invite to book you’re eligible – just visit the NHS website, use the NHS App or call 119 to get an appointment in your diary.”