One thing I’m curious about and on which I haven’t been able to find any good data/information is whether the drop in vaccine efficacy is a function of time since last dose (i.e. due to waning over time) or whether the third dose drives up total antibody or T-cell activity and/or broadens the immune response which leads to it being more effective against Omicron.

My spouse and I have both had boosters but my child has only had two doses because they only recently authorized use for children ages 5-11. I think my spouse and I are fairly well protected but it’s uncertain if my child is well protected or not given the timing of everything.