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Why are people with COVID antibodies from successful recovery forced to get vaccines?"Successful recoveries" alone is not an indication that you are now immune to COVID-19 or able to handle a reinfection well. There are reported cases of reinfections, with the second COVID-19 infection being far more serious and even deadly.
Also, it has been observed that vaccination ensures a better antibody response to some variants than a prior infection.
https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm
Even though none of the current batch of vaccines ensure perfect immunity, they all do ensure that the immune response to subsequent infections is good enough to not even warrant any additional care beyond quarantine to avoid transmitting to anyone else.
Anyone can find answers to those questions with a quick Google search. What happened to "I do my own research"?