Pfizer CEO said boosters may be needed. Unlikely
1) T cell immunity from vax (and Abs) work against variants; 2) T cells last long time- 34 y & counting after measles vax; 3) 1st SARS recovered have T cells 17 yr later; 4) Covid Vax generate memory B cells (lymph node biopsy)

— Monica Gandhi MD, MPH (@MonicaGandhi9) April 16, 2021