Humoral response after the booster dose of anti-SARS-CoV-2 vaccine in multiple sclerosis patients treated with high-efficacy therapies.

Anti-SARS-CoV2 mRNA vaccines showed a blunted antibody (Ab) response in people with MS (pwMS) on high efficacy therapies, suggesting the need for a booster dose. We evaluated the kinetics of the production of anti-receptor binding domain (RBD) Immunoglobulins G (IgG) after the vaccination cycle and the booster in pwMS receiving ocrelizumab, fingolimod and cladribine. A significant increase of anti-RBD IgG seroconversion was observed after booster respect to the vaccination cycle. Results obtained from this study will be useful for the management of pwMS in relation to their disease modifying therapy (DMT) and for any future vaccination campaign.