A World Health Organization advisory body has stuck by its decision not to recommend Covid-19 booster shots for now, but says it will keep a close watch on the impact of the new Omicron coronavirus variant.The Strategic Advisory Group of Experts on Immunisation (Sage) reviewed data from recent months on how well Covid-19 vaccines are holding up over time at a special meeting on Tuesday. They did not discuss data on Omicron, as preliminary studies are only starting to emerge.The group looked at…

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