Britain was the first nation to limit international travel over the Omicron variant, raising alarm bells regarding its mutations, and in December introduced work-at-home advice, more mask-wearing and vaccine passes to check its spread.
Though cases soared to record highs, hospitalizations and deaths have not increased by the same extent, in part because of Britain's booster rollout and the variant's lesser severity.
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Johnson's approach to avoiding lockdowns and living with the virus contrasts with a zero-tolerance approach to COVID-19 in China and Hong Kong, and stricter regulations in many other European nations.
"Many nations across Europe have endured further winter lockdowns... but this government took a different path," Johnson told lawmakers, stating the government had got the most challenging conclusions right and that numbers going into intensive care were falling.
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"Our scientists believe it is likely that the Omicron wave has now peaked nationally... because of the extraordinary booster campaign, together with the way the public have responded to the Plan B measures, we can return to Plan A."
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Johnson announced that none of the so-called Plan B measures would stay, as face masks would not be legally enforced anywhere, COVID passes would not be mandatory, and advice to work from home would end.
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Johnson has encountered denunciation for his handling of the pandemic overall, and Britain has reported 152,513 deaths, the seventh-highest total globally. Scotland, Wales, and Northern Ireland have pursued their own anti-Coronavirus measures, generally with tougher limitations, though they have started to ease them.
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Johnson wishes to reset his agenda following the uproar over the lockdown gatherings at his office, which has some in his party plotting to remove him.
Johnson admitted he attended a party in the garden of his Downing Street office and residence in May 2020 while social mixing was banned.
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The lifting of Plan B measures, along with Johnson's navigation of Omicron without resorting to a stringent lockdown, could assist him in appeasing vocal opponents of restrictions in his own caucus amid the party unrest.
He said that if data supported it, he may end the legal requirement for people to self-isolate if they test positive before the regulation lapses in March.
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"But to make that possible, we must all remain cautious during these last weeks of winter," he stated, warning of continued pressure on hospitals.
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"The pandemic is not over," Johnson stressed.
A third of Britain's 15 million cases have been reported since the onset of Omicron. By contrast, Britain has reported 5% of its COVID deaths since the variant was identified in late November.