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Published 20:25 12 Dec 2021 GMT
Updated 04:46 13 Dec 2021 GMT

Johnson was speaking on Sunday evening when he delivered a Covid update, just hours after it was announced that the UK's coronavirus alert level would be raised from level three to level four due to the spread of new Omicron variant.
He added: "I'm afraid we're now facing an emergency in our battle with the new variant Omicron."
"It is now clear that two doses of vaccine are simply not enough to give the level of protection we all need. But the good news is that our scientists are confident that with a third dose, a booster dose, we can all bring our level of protection back up."
"At this point our scientists cannot say that Omicron is less severe," said Johnson.
"And even if that proved to be true, we already know it is so much more transmissible that a wave of Omicron through a population that was not boosted would risk a level of hospitalisation that could overwhelm our NHS and lead sadly to very many deaths."
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