Influence of diabetes and comorbidities on the immune response to SARS-CoV-2 vaccination
DOI:
https://doi.org/10.47196/diab.v58i3.1139Keywords:
diabetes, antibodies, immunosenescence, vaccination, COVID-19, obesity, immune responseAbstract
Introduction: diabetes mellitus (DM) is a prevalent comorbidity in people with COVID-19, and those who have it face a higher risk of severe complications due to alterations in their immune system. During the SARS-CoV-2 pandemic, vaccination became a key tool to mitigate mortality, although its effectiveness in people with DM has been a subject of investigation. Recent studies have suggested that hyperglycemia and obesity, common in people with DM, might influence the immune response to vaccines.
Objectives: to evaluate the difference in IgG anti-SARS-CoV-2 antibody levels between patients with type 1 diabetes mellitus (T1DM), type 2 diabetes mellitus (T2DM), and a non-diabetic control group after receiving the second vaccine against COVID-19. To examine the influence of weight and age on these outcomes.
Materials and methods: a longitudinal observational study was conducted on 152 individuals (91 with T2DM, 53 controls, and 8 with T1DM). Clinical and demographic data were collected, and IgG anti-SARS-CoV-2 antibody levels were measured using chemiluminescence. Statistical analyses included multiple linear regression and logistic regression to evaluate multivariate associations.
Results: patients with T1DM and T2DM showed significantly lower antibody levels post-vaccination compared to the control group (geometric mean: control 16.36, T1DM 6.16, T2DM 9.94). Age was inversely correlated with antibody levels (partial correlation coefficient -0.26, p=0.0015). No significant association was found between BMI and antibody levels. Logistic regression indicated a significant decrease in antibody titers starting at age 62.
Conclusions: patients with diabetes exhibit a reduced immunological response to the COVID-19 vaccination compared to non-diabetic individuals, with a lower production of antibodies that worsens with age. This study highlights the need to consider comorbidities and demographic factors when evaluating vaccine efficacy in specific populations. The findings suggest the potential importance of adapting vaccination strategies to optimize the immune response in patients with diabetes.
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