“…A few previous studies have investigated the relationship between SARS-CoV-2 infection and risk of new demyelinating events, or between SARS-CoV-2 infection and risk of clinical relapses in patients with MS. ( Verstrepen et al, 2020 , Yavari et al, 2020 , Corrêa et al, 2021 , Zhang et al, 2021 , Etemadifar et al, 2021 , Barzegar et al, 2021 , Garjani et al, 2021 , Michelena et al, 2022 , Ismail and Salama, 2022 , Etemadifar et al, 2022 , Bsteh et al, 2022 , Babtain et al, 2022 , Conway et al, 2022 , Kim et al, 2022 , Lotan et al, 2022 ) Many published studies were however limited to small case series, often lacked a matched control group, and did not include MRI data.…”