Reduced Antibody and Cellular Immune Responses Following Dual COVID-19 Vaccination Within Infection-Naïve Residents of Long-Term Care Facilities

2021 ◽  
Author(s):  
Gokhan Tut ◽  
Tara Lancaster ◽  
Megan S. Butler ◽  
David Bone ◽  
Nayandeep Kaur ◽  
...  
2021 ◽  
Author(s):  
Macedonia Trigueros ◽  
Edwards Pradenas ◽  
Dolors Palacin ◽  
Carlos Avila-Nieto ◽  
Benjamin Trinite ◽  
...  

Background: SARS-CoV-2 vaccination is the most effective strategy to protect elders living in long-term care facilities (LTCF) against severe COVID-19, but primary vaccine responses are less effective in older adults. Here, we characterized the humoral responses following 3 months after mRNA/BNT162b2 vaccine in institutionalized elders. Methods: Plasma levels of specific SARS-CoV-2 total IgG, IgM and IgA antibodies were measured before and 3 months after vaccination in elders living in LTCF. Neutralization capacity was assessed in a pseudovirus neutralization assay against WH1 (original) and B.1.617.2/Delta variants. A group of younger adults was used as reference group. Results: Three months after vaccination, uninfected-elders presented reduced specific SARS-CoV-2 IgG levels and significantly lower neutralization capacity against the WH1 and Delta virus compared to vaccinated uninfected younger individuals. In contrast, COVID-19 recovered elders showed significantly higher specific SARS-CoV-2 IgG levels after vaccination than younger counterparts, while showing similar neutralization capacity against WH1 virus and increased neutralization capacity against Delta variant. Despite previously infected elders elicit potent cross-reactive immune responses similarly to younger individuals, higher quantities of specific SARS-CoV-2 IgG antibodies are required to reach the same levels of neutralization. Conclusions: While hybrid immunity seems to be active in previously infected elders after three months from mRNA/BNT162b2 vaccination, humoral immune responses are diminished in COVID-19 uninfected vaccinated residents living in LTCF. These results suggests that a vaccine booster dose should be prioritized for this particularly vulnerable population.


2006 ◽  
Author(s):  
Jeremy Sharp ◽  
Kate L. Martin ◽  
Kate Martin

2014 ◽  
Vol 155 (23) ◽  
pp. 911-917 ◽  
Author(s):  
Rita Szabó ◽  
Karolina Böröcz

Introduction: Healthcare associated infections and antimicrobial use are common among residents of long-term care facilities. Faced to the lack of standardized data, the European Centre for Disease Prevention and Control funded a project with the aim of estimating prevalence of infections and antibiotic use in European long-term care facilities. Aim: The aim of the authors was to present the results of the European survey which were obtained in Hungary. Method: In Hungary, 91 long-term care facilities with 11,823 residents participated in the point-prevalence survey in May, 2013. Results: The prevalence of infections was 2.1%. Skin and soft tissues infections were the most frequent (36%), followed by infections of the respiratory (30%) and urinary tract (21%). Antimicrobials were mostly prescribed for urinary tract infections (40.3%), respiratory tract infections (38.4%) and skin and soft tissue infections (13.2%). The most common antimicrobials (97.5%) belonged to the ATC J01 class of “antibacterials for systemic use”. Conclusions: The results emphasise the need for a national guideline and education for good practice in long-term care facilities. Orv. Hetil., 2014, 155(23), 911–917.


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