Comparison of neutralization titers over 6 months in young adults (Control) and Nursing Home Residents. Two Subgroups: 1) Prior Infection then Vaccinated. 2) Infection Naive then Vaccinated. Those with prior infection demonstrate greater capacity for sustained neutralization. 
Even though the median drops about 18 fold over 6 months in both subgroups, those with prior infection maintain a ~3-4 fold higher neutralization titer over the course of 6 months post vax, with a larger percentage of spread above the median than the infection naive.
In addition, approximately 70% of the infection naive group in nursing home residents demonstrated neutralization titers that were below the lower limit of detection (LLD) after 6 months post vax.
Simply looking at neutralization titers/antibody levels is incomplete in terms of quantifying immunity. A natural infection also generates T Cell and B cell memory responses to a large set of different proteins (and variants) from the virus, whereas vaccination is based on 1.
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