[belter]

For a temporary amount of time...

"Viral loads of Delta-variant SARS-CoV-2 breakthrough infections after vaccination and booster with BNT162b2"

https://www.nature.com/articles/s41591-021-01575-4

"...By analyzing viral loads of over 16,000 infections during the current, Delta-variant-dominated pandemic wave in Israel, we found that BTIs in recently fully vaccinated individuals have lower viral loads than infections in unvaccinated individuals. However, this effect starts to decline 2 months after vaccination and ultimately vanishes 6 months or longer after vaccination..."

[ceejayoz]

Sure. Eating is similar; after a while, you have to do it some more. As a result, we build a large infrastructure to ensure people can get new food when they need it, so starvation isn't endemic.

If vaccines and their boosters infer temporary immunity, there's a certain level of rapid vaccine production and administration that can leverage that temporary immunity. Whether we can reach it is somewhat of a political problem.