> Aren't antibody titers just one measure of immunity?
Yes. But Omicron just came out 3 weeks ago.
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We start with the quickest measures of immunity. As better data comes in, we change our opinion. The gold-standard is a large-scale, multi-month A/B test. There simply hasn't been enough time for that to be created.
If these smaller tests prove adequate, we probably will skip the large-scale test... much like Alpha and Delta, it seems like these variants don't last very long in practice. We just barely finished studying Delta's effects across a variety of treatments, and all of that data is about to become obsolete with a new variant.
Yes. But Omicron just came out 3 weeks ago.
--------
We start with the quickest measures of immunity. As better data comes in, we change our opinion. The gold-standard is a large-scale, multi-month A/B test. There simply hasn't been enough time for that to be created.
If these smaller tests prove adequate, we probably will skip the large-scale test... much like Alpha and Delta, it seems like these variants don't last very long in practice. We just barely finished studying Delta's effects across a variety of treatments, and all of that data is about to become obsolete with a new variant.