Waning Humoral Immune Response to SARS-CoV-2 Vaccination with Symptomatic Infection after Initiation of Anti-CD20 Treatment in a Patient with Multiple Sclerosis

Waning humoral responses to SARS-CoV-2 vaccination have been reported arguing for booster vaccinations even in healthy populations. Multiple sclerosis (MS) immunotherapy with anti-CD20 monoclonal antibodies may negatively influence morbidity and mortality of COVID-19. The opportunity to treat patients at risk for a severe COVID-19 course with specific monoclonal antibodies targeting SARS-CoV-2 represents an important novel measure for patient safety. We report a patient with waning humoral vaccination response around five months after two mRNA vaccination doses upon initiation of ocrelizumab treatment. Symptomatic COVID-19 infection was treated with casirivimab/imdevimab with rapid symptom recovery.