The US biotech company Moderna has said that a booster dose of its COVID-19 vaccine appears to protect against the Omicron variant, according to early laboratory tests.The company said on Monday that its current vaccine would continue to be its “first line of defence against Omicron”, although Moderna still plans to develop a vaccine to protect specifically against Omicron.The vaccine maker said it will continue to focus on its current version of the vaccine, mRNA-1273, in a decision motivated by the speed of the spread of Omicron
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