“their T-cell response is biased toward earlier versions of Sars-Cov-2 - not to the Omicron variant that has actually infected them. “
Flu shots. You are protected against last year’s strain. Great if you do time travel.
“Flu shots. You are protected against last year’s strain. Great if you do time travel.”
Last year’s strain—in the Southern Hemisphere—so you need both time travel and physical travel.
;-)