In neutralization assays, @BalazsLab observes only a 4-fold or 6-fold reduction in titer going from wild-type to Omicron after booster relative to 43-fold or 122-fold after initial mRNA vaccine series (https://t.co/EuHC1fuHWP). 4/14 pic.twitter.com/AidMZkxzUd

— Trevor Bedford (@trvrb) December 20, 2021