Previous SARS-CoV-2 Infection, Age, and Frailty Are Associated With 6-Month Vaccine-Induced Anti-Spike Antibody Titer in Nursing Home Residents.
Adam H Dyer, Claire Noonan, Matt McElheron and 17 others
PMID 35219507WHAT IT FOUND
In nursing home residents, previous SARS-CoV-2 infection was linked to much higher vaccine antibody levels at 6 months, while older age and frailty were linked to lower levels.
This did not show clinical protection.
Key findings
01At 5 weeks after vaccination, all participants had anti-Spike RBD antibody responses, and the response was much greater in those with previous SARS-CoV-2 infection than in SARS-CoV-2-naive participants.
02By 6 months, antibody titers had declined in all participants, including both previously infected and SARS-CoV-2-naive residents.
03At 6 months, previous SARS-CoV-2 infection, older age, and frailty were independently associated with antibody titer.
STILL TO COME
How it was doneWhat they foundWhat it means for RNs
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What it does not show
The study included only 86 residents, so the antibody associations may not be stable. It measured lab antibody levels, not breakthrough infection, severity, or mortality, so it did not show clinical protection. It did not assess cellular immune responses. The regression was exploratory, and predictors were selected from bivariate analysis with a P value below .10. Residents were excluded if they were receiving systemic immunosuppressive therapy or chemotherapy, had systemic autoimmune disease, acute infections, or known active malignancy, so results may not apply to those groups. The study did not test a booster dose or compare vaccine schedules.
The easy way to misread this
Do not read the antibody differences as proof of protection or booster benefit. The study measured antibody titers only and did not test a third dose or show clinical infection outcomes.