If you hit a paywall with this NY times article, go to tool/menu-bar ' view ' and choose ' reader view '.
...." That’s why six months ago many scientists,
including us, thought the next variant would descend from Delta, which
was dominant at the time. But evolution defied our expectations, and we
got Omicron, which has a huge number of mutations and isn’t descended
from Delta. It’s not known exactly how the virus made the big
evolutionary jump that led to Omicron, although many scientists
(including us) suspect the variant may have emerged from someone who couldn’t fight off the virus well, allowing it time to mutate. "...
..." Taking all this together, we expect SARS-CoV-2 will continue to cause
new epidemics, but they will increasingly be driven by the ability to
skirt around the immune system. In this sense, the future may look
something like the seasonal flu, where new variants cause waves of cases
each year. If this happens, which we expect it will, vaccines may need
to be updated regularly similar to the flu vaccines unless we develop broader variant-proof vaccines. "..
..." But we do know that immunity reduces disease severity even when it
doesn’t fully block infections and spread, and immunity gained from
vaccination and prior infections has helped blunt the impact of the
Omicron wave in many countries. Updated or improved vaccines and other
measures that slow transmission remain our best strategies for handling
an uncertain evolutionary future. ".....