Analysis: top-up vaccines make important changes to our antibody defences, reducing the threat from Omicron
Covid-19, we should know by now, is a moving target. In autumn the rollout of boosters to older age groups was contentious. Now they’re the single biggest focus. So why do boosters help so significantly compared with first and second jabs, and are we on a conveyor belt towards needing an ever-increasing number of top-ups?, it was clear boosters would be required to maintain the levels of protection against infection, although protection against severe illness appeared to be holding up well.
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