Coronavirus
A person in California has tested positive for the new Covid-19 variant, which was first identified by researchers in South Africa.
Here's how to reduce your chance of catching and spreading Covid before you're called up for your third jab.
Boris Johnson is under fire following reports he partied with staff in the run-up to Christmas and while the UK was in lockdown.
The health secretary has urged people to continue with their festive plans but has advised they take precautions.
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The prime minister tried to strike a positive tone, saying temporary vaccination centres will be "popping up like Christmas trees".
“No. Our advice to the public is as set out at the weekend," the prime minister's spokesman replied.
The government has just changed the rules around mask-wearing to combat the spread of the Omicron variant.
There are similarities with previous Covid variants, and three new symptoms.
Jenny Harries, the chief executive of the UK Health Security Agency, also said working from home would be a 'good thing to do' if the new variant began to surge.