Perhaps you've been hearing about the possible need for a third Covid shot, and that the vaccines may have waning immunity. The issues aren't simple ones.
The Atlantic has a longish, thorough article which describes how they work and what to think about their effectiveness. If you want a one-word evaluation, that word would be "upbeat."
The science is too complicated for me to attempt a summary here. If the issue interests you, the article will help.
When the booster shots become available later this month, as an old crock I plan to get one. It is my ambition to get even older, which requires surviving.
