Although it did not reach statistical significance, there was a small increase in the geometric mean NT 50 against WT in the elderly after the fourth vaccine dose and a significant 2.8-fold increase compared with younger individuals who received a third dose ( Bar-On et al., 2022 ; Regev-Yochay et al., 2022 ; P = 0.007; Fig. 1 D ).
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Memory B cell development elicited by mRNA booster vaccinations in the elderly.
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