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Reumatologia/Rheumatology
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4/2021
vol. 59
 
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Editorial

Update on COVID-19 vaccines and autoimmune-mediated rheumatic diseases

Lakshmanan Suresh
1

1.
Department of Oral Diagnostic Sciences, University at Buffalo, NY, United States
Reumatologia 2021; 59, 4: 203–205
Online publish date: 2021/08/13
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Providing lasting long-term immunity through effective vaccines for current and emerging strains of coronavirus disease 2019 (COVID-19) providing lasting long-term immunity is fundamental to overcoming the pandemic. Recently approved COVID-19 vaccines have brought tremendous promise to help end this pandemic. As of July 20, 2021, the main vaccines that have been approved for use in North America and Europe are the mRNA vaccines BNT162b2 (Pfizer-BioNTech) and mRNA-1273 (Moderna), and the viral vector vaccines ChAdOx1 (AstraZeneca) and Ad26.COV2.S (Johnson & Johnson) [1].
Autoimmune-mediated rheumatic diseases (ARDs) are a wide group of disorders that primarily affect the joints, bones, muscle, and connective tissue, affecting about 3–5% of the Western population [2, 3]. The optimal management of ARDs requires therapies that result in immunomodulation and immune suppression. This not only increases the risk of contracting COVID-19 infections but also can attenuate the vaccine-mediated antibody response. Multiple rheumatology organizations including the American College of Rheumatology, the European League Against Rheumatism (EULAR), the British Society of Rheumatology and the Canadian Rheumatology Association encourage and recommend COVID-19 vaccines, indicating that patients with ARDs should be encouraged to receive a COVID-19 vaccine, regardless of treatment regimen or underlying diagnosis [4, 5]. The American College of Rheumatology (ACR) has recently published clinical guidance related to the timing of COVID-19 vaccination in relation to use of immunomodulatory therapies in ARD patients (Fig. 1).
They recommend not to delay COVID-19 vaccination for most immunomodulatory therapies except for rituximab (RTX). The panel further recommended vaccination to be scheduled such that the vaccine series would be initiated ~4 weeks prior to the next scheduled RTX dose. The ACR panel did not reach a consensus on ARD patients receiving glucocorticoids at a prednisone-equivalent dose of ≥ 20 mg per day [6]. Emerging data demonstrate reduced antibody responses in immunosuppressed individuals following mRNA vaccination [7, 8]. Among the immunosuppressed individuals there was heterogeneity of the humoral response to COVID-19 vaccines depending on the underlying condition. Organ transplant recipients receiving anti­metabolite therapy and older recipients were less likely to develop an antibody response following the first dose of the BNT162b2 or the mRNA-1273 vaccines [7, 9]. Individuals with ARDs who received mRNA vaccines showed greater reduction in magnitude and quality of antibody responses compared to immunocompetent controls (Table I). Independent of dosage, glucocorticoid use showed a 10-fold reduction in antibody titers following SARS-CoV-2 vaccination. Moreover, use of prednisone in combination with other medications further attenuated antibody titers compared to other medications taken alone [8]. Currently, there is no consensus on the optimal anti­body titers needed for protection and neutralization of the virus. There are gaps in knowledge on the correlates of vaccine-induced immune protection such as levels of neutralization, B cell memory responses and the role of the T cell contribution in long-term immunity to COVID-19. Consequently, ACR guidelines do not advocate routine measurement of antibody levels after vaccination in ARD patients. However, there are emerging data on vaccine titers and efficacy. Recent studies of the BNT162b2 vaccines showed that the efficacy against the virus gradually decreased after attaining a peak of 96.2% after one month. The antibody titers gradually declined to 83.7%, four months after dose 2. There was an average decline in efficacy of approximately 6% every 2 months [10]. Ibarrondo et al. [11] reported that the antibodies developed from vaccination and natural mild infection showed similar characteristics in that their wane was slow but constant. There was an average decline of antibody titers of approximately 90% in 3 months after infection or vaccination.
Similar findings were reported in another study of Pfizer-BioNTech mRNA vaccine in 118 subjects [12]. This study demonstrated a significant decline in antibody levels 6 weeks after the 2nd dose. Older individuals showed a faster decline in their antibody levels and a weaker cellular immune response. Our internal data (unpublished) indicate that anti­body titers reach a peak 1 month after the 2nd dose and there is a significant drop in antibody of over 70% 5 months after the 2nd dose of the vaccine. Emerging and accumulating data point to waning vaccine-induced COVID immunity levels and a possible need for booster vaccination based on measurement of antibody levels, particularly in the immunocompromised, including ARD individuals. There is historical precedence for administering booster vaccines and for monitoring post-vaccine serology titers, especially in immunosuppressed and immunocompromised patients, and particularly in hepatitis B patients. While routine monitoring of COVID-19 antibody responses is not yet advocated, there is increasing evidence that monitoring the antibody levels on a regular basis (six months to a year) may support optimal management of the patients.
The author declares no conflict of interest.

References

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Copyright: © 2021 Narodowy Instytut Geriatrii, Reumatologii i Rehabilitacji w Warszawie. This is an Open Access article distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) License (http://creativecommons.org/licenses/by-nc-sa/4.0/), allowing third parties to copy and redistribute the material in any medium or format and to remix, transform, and build upon the material, provided the original work is properly cited and states its license.






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