Two doses of a Covid vaccine are not enough to stop you catching the Omicron variant, UK scientists have warned.
Early analysis of UK Omicron and Delta cases showed the vaccines were less effective at stopping the new variant.
But a third booster prevents around 75% of people getting any Covid symptom.
There is optimism that vaccines will still keep many people out of hospital even if more do get Covid. Data on severity could be published next week.
“We expect the vaccines to show higher protection against the serious complications of COVID-19, so if you haven’t yet had your first two doses please book an appointment straight away.”