It is feared this winter season could see coronavirus infections rise.
And the British government says it wants to prepare for the worst.
It has announced a roll out of third doses of vaccine from next week.
Around 30 million people will be eligible, including everyone aged over 50, people with underlying conditions and health workers.
They will be given at least six months after a person has had a second dose.
But is that enough?

Presenter: Kim Vinell

Guests:
Chris Smith, Consultant virologist and Editor of The Naked Scientists
Patrick Tang, Division Chief of Microbiology at Sidra Medicine
Azeddine Ibrahimi, Head of Biotechnology Lab at the Rabat Medical School

- Subscribe to our channel: http://aje.io/AJSubscribe
- Follow us on Twitter: https://twitter.com/AJEnglish
- Find us on Facebook: https://www.facebook.com/aljazeera
- Check our website: https://www.aljazeera.com/

#UKcovid19 #BoosterShots #VaccineEquality