This is a three-cohort, multicenter, prospective study of up to 66 relapsing MS participants. The first cohort will be participants receiving an mRNA COVID-19 vaccine at least two weeks prior to ofatumumab start. The second cohort will be participants receiving an mRNA COVID-19 vaccine at least four weeks after beginning ofatumumab. The third cohort will be participants currently on an interferon or glatiramer acetate planning to receive COVID-19 mRNA vaccine. Participants will obtain the COVID-19 mRNA vaccine from their HCP (private insurance) or appropriate federal, state or local program.
This study will evaluate if participants treated with ofatumumab 20 mg subcutaneous (s.c.) administered once monthly can develop an adequate immune response to the COVID-19 mRNA vaccine compared to participants on an interferon or glatiramer acetate.