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The Omicron variant of coronavirus is less likely to cause long Covid than previous variants, according to the first peer-reviewed study of its kind from the UK. Researchers at King's College London, using data from nearly 100,000 people who logged their Covid symptoms via an app, found the odds of developing long Covid after infection were 20 per cent to 50 per cent lower during the Omicron wave in the UK compared to Delta. The figure varied depending on the patient's age and the timing of their last vaccination. Long Covid, which includes prolonged symptoms ranging from fatigue to 'brain fog', can be debilitating and continue for weeks or months. It is increasingly being recognised as a public health problem, and researchers have been racing to find out if Omicron presents as big a risk of long Covid as previously dominant variants. The study from King's is believed to be the first academic research to show Omicron does not present as great a risk of long Covid, but that does not mean long Covid patient numbers are dropping, the team said. While the risk of long Covid was lower during Omicron, more people were infected, so the absolute number now suffering is higher. "It's good news, but please don't decommission any of your long Covid services," lead researcher Dr Claire Steves said, appealing to health-service providers.

It is not sustainable to give Covid-19 booster shots every three to six in the long term, Britain's chief scientific adviser said on Tuesday (January 4), even though the booster rollout is needed in the short term to combat the Omicron variant. "It would be a situation that isn't tenable to say everyone's going to need to be having another vaccine every three or six months. "That's not the long-term view of where this goes to," Patrick Vallance said at a news conference, adding that annual booster shots against Covid-19 might be necessary, similar to flu shots.