Rate of reinfection is currently rare, but vaccination post infection does lower that rate. https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm?s_cid=mm7032e1_

Rate of reinfection is currently rare, but vaccination post infection does lower that rate. https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm?s_cid=mm7032e1_w https://www.cdc.gov/mmwr/volumes/70/wr/mm7032e1.htm?s_cid=mm... "Among Kentucky residents infected with SARS-CoV-2 in 2020, vaccination status of those reinfected during May–June 2021 was compared with that of residents who were not reinfected. In this case-control study, being unvaccinated was associated with 2.34 times the odds of reinfection compared with being fully vaccinated." Additionally, there have also been some preprints indicating reduction of long covid symptoms following vaccination in a good portion of those surveyed.