2021
DOI: 10.1136/jnnp-2021-327612
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Humoral immunity to SARS-CoV-2 mRNA vaccination in multiple sclerosis: the relevance of time since last rituximab infusion and first experience from sporadic revaccinations

Abstract: IntroductionThe effect of disease-modifying therapies (DMT) on vaccine responses is largely unknown. Understanding the development of protective immunity is of paramount importance to fight the COVID-19 pandemic.ObjectiveTo characterise humoral immunity after mRNA-COVID-19 vaccination of people with multiple sclerosis (pwMS).MethodsAll pwMS in Norway fully vaccinated against SARS-CoV-2 were invited to a national screening study. Humoral immunity was assessed by measuring anti-SARS-CoV-2 SPIKE RBD IgG response … Show more

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Cited by 50 publications
(58 citation statements)
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“… 21 We defined antibody concentrations higher than the second percentile of those from healthy individuals vaccinated with two doses, corresponding to concentrations of 70 AU/mL or more, as response. 22 Concentrations of less than 5 AU/mL were defined as no response and concentrations of 5–69 AU/mL were defined as weak response. Calibration to the WHO international standard showed that 70 AU/mL corresponds to approximately 40 binding antibody units per mL.…”
Section: Methodsmentioning
confidence: 99%
“… 21 We defined antibody concentrations higher than the second percentile of those from healthy individuals vaccinated with two doses, corresponding to concentrations of 70 AU/mL or more, as response. 22 Concentrations of less than 5 AU/mL were defined as no response and concentrations of 5–69 AU/mL were defined as weak response. Calibration to the WHO international standard showed that 70 AU/mL corresponds to approximately 40 binding antibody units per mL.…”
Section: Methodsmentioning
confidence: 99%
“…Pooled very-low-certainty evidence (Supplementary Figure 9) suggests lower odds of anti-S1 seroconversion among pwMS on ALEM compared to UX people (OR [95%CI]: 0.32 [0.10, 0.96], P=0.04). One study assessed anti-S seroconversion, but its data could not be extracted 30 . PwMS on ALEM in three studies 16,25,28 showed 100% seroconversion rates similar to the UX people in two of them 16,25 , and none of the studies suggested lower concentrations of post-vaccination antibodies among them – not even the study that indicated lower odds of seroconversion 26 .…”
Section: Resultsmentioning
confidence: 99%
“…20,22,23 Understanding the impact of DMTs on the immune response to SARS-CoV-2 infection is critical for counseling patients with MS about COVID-19 risks and determining whether a patient who experienced COVID-19 on a particular DMT is likely to derive a similar degree of protective immunity as untreated individuals. [24][25][26][27] To address the knowledge gaps, we designed a prospective study with the goals of: (1) determining the impact of ocrelizumab (OCR) and other DMTs on the development of cellular and humoral immune memory to SARS-CoV-2 natural infection; (2) characterizing the relationship between humoral and cellular post-infection immune responses in patients with and without peripheral B-cell depletion; and (3) investigating the relationship between the clinical severity of COVID-19 and immune responses to SARS-CoV-2 in patients with MS with different DMTs. We recruited a large, ethnically diverse group of patients with MS from the New York University Multiple Sclerosis Care Center in New York City, New York, one of the epicenters of the COVID-19 pandemic in 2020 to 2021, 28,29 and comprehensively characterized humoral and cellular responses to SARS-CoV-2 using several complementary antibody and T-cell SARS-CoV-2-specific assays.…”
mentioning
confidence: 99%