“Experts say the public’s disinterest in the latest Covid shots is likely a combination of poor messaging from authorities, a diminishing fear about a virus that three years ago was wholly unknown, and the political polarization of the pandemic itself. But whatever the reasons, that vaccine ambivalence still poses a health threat.
Elderly people and very young infants continue to have a higher chance than the rest of the population that they will be hospitalized with Covid-19. Vaccination rates have fallen off for the former group, who are also most likely to die from an infection, and they were never strong to begin with for the latter”
…
“The known unknowns for the future, which could spur another round of investment and interest in updated Covid-19 vaccines, are biological. The virus has been evolving and will continue to evolve and could, in theory, reach a point where the current vaccines are ineffectual.
The other question mark is inside of us. The reason many people still enjoy protection from serious illness is because our body’s T-cells are familiar with the virus and can activate when they detect it. They may not be able to stop an infection entirely (that is the role of antibodies, which are quicker to fade) but they can stamp out the virus before a person becomes too sick.
What we don’t know today is how long our T cells’ memory will last, and how durable that immunity really is. The only way to find out is for more time to pass.”
https://www.vox.com/policy/2023/11/17/23964294/covid-19-vaccine-2023-us-vaccination-rates