“On the contrary, [given] many of us, even with high apparent antibody levels, actually show [very little] protective neutralisation of Omicron, there is all the more urgency to use [fourth] doses – in all age groups – to boost levels back up into the protective range.”
https://sg.yahoo.com/news/fourth-covid-j...21439.html
https://sg.yahoo.com/news/fourth-covid-j...21439.html