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Dyer A, Noonan C, Reddy C, Garcia L, Batten I, McElheron M, Roche N, Connolly E, Boran G, White M, Pelleau S, Leonard A, O'Neill D, Fallon A, O'Farrelly C, Bourke N, Kennelly S. 16 SARS-COV-2 INFECTION AND VACCINATION PATTERNS DETERMINE LONG-TERM ANTIBODY RESPONSES IN NURSING HOME RESIDENTS: DATA FROM NH-COVAIR. Age Ageing 2022. [PMCID: PMC9620582 DOI: 10.1093/ageing/afac218.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Background Older Nursing Home Residents (NHRs) are at greatest risk of morbidity and mortality from SARS-CoV-2, particularly in the context of both waning vaccine efficacy and the emergence of Variants-of-Concern (VOCs). However, the determinants of long-term vaccine-induced protective antibody responses are yet to be determined in this group. Methods NH-COVAIR recruited older NHRs for comprehensive clinical and frailty (NH-FRAIL) assessment. Blood samples were obtained pre-vaccination, at 6-weeks and 6-months following primary vaccination and 6-months following booster vaccination. Antibody titres were measured using both an electrochemiluminescence assay and a custom bead-based array (Luminex™) to measure antibody titre and avidity for Wuhan strain/major VOC antigens. Stepwise adjusted linear regression (log-transformed) assessed longitudinal determinants of vaccine-induced antibody responses. Results Of 86 participants (81.1 ± 10.8 years; 65% female), just under half (45.4%) had evidence of previous SARS-CoV-2 infection. All NHRs mounted a significant antibody-response to vaccination at 5 weeks followed by a significant decrease in antibody titre by 6 months. Previous SARS-CoV-2 infection was the strongest predictor of antibody waning at all timepoints (β: 3.59; 2.89, 4.28; P < 0.001 for 6-months). Independent of infection history, both age (β: –0.05; –0.08, –0.02; p<0.001) and frailty (β: –0.22; –0.33, –0.11; p<0.001) were associated with faster antibody waning at 6-months. Cross-reactivity and avidity were significantly lower for Beta (B.1.351) and Gamma (P.1) VOC strains (all p<0.001). Additionally, there was faster antibody waning and significantly reduced antibody avidity to Beta and Gamma VOCs in SARS-CoV-2 naïve NHRs. Conclusion Older NHRs are capable of mounting protective antibody responses to SARS-CoV-2 vaccination. Responses were more durable, with a greater cross-reactivity to and avidity for VOCs in those with previous SARS-CoV-2 infection. Increasing age and greater frailty in NHRs was associated with faster antibody waning. Our findings support ongoing serological surveillance and use of additional vaccine doses in older NHRs, particularly in those without previous SARS-CoV-2 exposure.
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Affiliation(s)
- A Dyer
- Tallaght University Hospital Age-Related Healthcare, , Dublin, Ireland
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - C Noonan
- Tallaght University Hospital Age-Related Healthcare, , Dublin, Ireland
| | - C Reddy
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - L Garcia
- Infectious Diseases Epidemiology and Analytics Unit, Institut Pastuer , Paris, France
| | - I Batten
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - M McElheron
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - N Roche
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - E Connolly
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - G Boran
- Tallaght University Hospital Department of Clinical Biochemistry, , Dublin, Ireland
| | - M White
- Infectious Diseases Epidemiology and Analytics Unit, Institut Pastuer , Paris, France
| | - S Pelleau
- Infectious Diseases Epidemiology and Analytics Unit, Institut Pastuer , Paris, France
| | - A Leonard
- Tallaght University Hospital Department of Clinical Biochemistry, , Dublin, Ireland
| | - D O'Neill
- Tallaght University Hospital Age-Related Healthcare, , Dublin, Ireland
| | - A Fallon
- Tallaght University Hospital Age-Related Healthcare, , Dublin, Ireland
| | - C O'Farrelly
- Trinity College Dublin Comparative Immunology, , Dublin, Ireland
| | - N Bourke
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
| | - S Kennelly
- Tallaght University Hospital Age-Related Healthcare, , Dublin, Ireland
- Trinity College Dublin Department of Medical Gerontology, , Dublin, Ireland
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Abstract
The complexes PdL2X2 (L = p-nitrosodimethylaniline, p-nitrosodiethylaniline; X = Cl, Br, I) have been prepared. The principal absorption band in the visible spectra of the complexes has been identified as a π–π* transition centered primarily on the ligands on the basis of its high oscillator strength, the similarity of the latter to that of the free organic ligand, and the insensitivity of the band position to the nature of the halide. Infrared data indicate that palladium is bonded through the NO group.
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