system
Given the following post, respond as if you're commenting on Reddit:
human
Would it be beneficial or harmful to get more than two doses of the Pfizer or Modern COVID-19 vaccine?

If the purpose of two shots is to increase the efficacy and long term staying power of the antibodies, then could you theoretically get as many vaccine doses as you wanted? Would this be helpful for protecting from COVID? Would it be harmful? Is there a diminishing return after a certain point?
gpt
It would not be harmful, but it probably would not provide much in terms of additional protection.

For example, in the MMR vaccine, they give it in two doses.  One dose is 78% effective against mumps, the second dose raises it to 88%, certainly a diminished return, but still significant.  Two doses of COVID vaccine gets you to 95%, not much more ro be gained.