system
Given the following post, respond as if you're commenting on Reddit:
human
Does immunity from a virus get remembered for longer if a recovered person is exposed continually to it?

I read somewhere else that after recovery, immunity from covid19 lasts around three months. Which is the amount of time our immune system spends resources on creating antibodies specific to that virus.

However, does that take in account if the person is continually exposed to infected people? Is it possible for her/his immune system to get a "memory refresh"? Something like a signal in the body that says "hey, I know you can't remember coronaviruses well but you still need immunity for this"?
gpt
You did not read that immunity only lasts 3 months. No one knows how long immunity lasts.  You read that antibody titers drop off after 3 months.  Antibodies drop off after a few months for many viruses.  Memory B cells are responsible for long term immunity.