Professor Jonathan Van-Tam answers your vaccine questions.
The Deputy Chief Medical Officer for England tells Sky News that revaccinating may be needed if variants 'outwit' us.
He also says the risk factors for how seriously ill people get with COVID is down to "age, age, and age - it's the absolute driver and the biggest factor".
SUBSCRIBE to our YouTube channel for more videos: www.youtube.com/skynews
Like us on Facebook: www.facebook.com/skynews
Follow us on Instagram: www.instagram.com/skynews
Sky News videos are now available in Spanish here/Los video de Sky News están disponibles en español aquí www.youtube.com/channel/UCzG5BnqHO8oNlrPDW9CYJog
For more content go to news.sky.com and download our apps: