Tweet from EricTopol at March 16, 2022 at 02:18PM

“A third dose …was needed for induction of consistent neutralizing antibody titers against either BA.1 or BA.2.”
and
Why BA.2 out-competes with BA.1 is mostly related to its higher transmissibility, not more evasion of immune response.

— Eric Topol (@EricTopol)
Mar 16, 2022

from http://twitter.com/EricTopol