The studies have only gone on for, at most, 8 months. So for every time period studied so far, including the longest possible time periods, people retain immunity. Perhaps use this science to revise your initial belief/statement.
While I mostly agree, there have been a few rare cases of reinfection; here [0] is a metastudy that looks at several claims of reinfection, ultimately concluding that 6 cases were credible reinfections. So while the relative risk is very low, I think one could make a plausible argument that since the risk of harmful side effects is also low, getting vaccinated may be beneficial.
There is also preliminary evidence [1] to indicate that post-infection vaccination can help to resolve lingering symptoms such as fatigue, breathlessness, and insomnia.
Vaccine-based immunity allows for a greater variance in neutralizing antibodies to form relative to the spike protein, compared to natural immunity attacking less critical vectors. Get the vaccine even if you had covid
Infection is possible with all vaccines as well. Resulting viral load will be what matters: How strong their immune response is, how infectious the re-infected patient is, and how severe their symptoms are.
It's not a binary "You have COVID" vs "You don't have COVID". Not for vaccines, nor for re-infections.
An unvaccinated health care worker set off a Covid-19 outbreak at a nursing home in Kentucky where the vast majority of residents had been vaccinated, leading to dozens of infections, including 22 cases among residents and employees who were already fully vaccinated, a new study reported Wednesday.
Immunity lasts a long time in the vast, vast majority of people. People that survived SARS-CoV-1 still have strong immune response almost two decades later. You are improperly conflating lack of antibodies with lack of immunity, they are not the same thing. Antibodies are the product of active infection, not having immunity.
It is unhelpful and disingenuous to suggest that lack of antibodies imply lack of immunity or that rare edge cases are the norm. In disease, there are always edge cases.