RT Journal Article SR Electronic T1 Longitudinal T-Cell Responses After a Third SARS-CoV-2 Vaccination in Patients With Multiple Sclerosis on Ocrelizumab or Fingolimod JF Neurology - Neuroimmunology Neuroinflammation JO Neurol Neuroimmunol Neuroinflamm FD Lippincott Williams & Wilkins SP e1178 DO 10.1212/NXI.0000000000001178 VO 9 IS 4 A1 Virginia Palomares Cabeza A1 Laura Y.L. Kummer A1 Luuk Wieske A1 Ruth R. Hagen A1 Mariel Duurland A1 Veronique A.L. Konijn A1 Koos P.J. van Dam A1 Eileen W. Stalman A1 Carolien E. van de Sandt A1 Laura Boekel A1 Niels J.M. Verstegen A1 Maurice Steenhuis A1 Theo Rispens A1 Sander W. Tas A1 Gertjan Wolbink A1 Joep Killestein A1 Taco W. Kuijpers A1 S. Marieke van Ham A1 Filip Eftimov A1 Anja ten Brinke A1 Zoé L.E. van Kempen A1 , YR 2022 UL http://nn.neurology.org/content/9/4/e1178.abstract AB Objectives To evaluate whether a third vaccination shows an added effect on severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) T-cell responses in patients with multiple sclerosis treated with ocrelizumab or fingolimod.Methods This is a substudy of a prospective multicenter study on SARS-CoV-2 vaccination in patients with immune-mediated diseases. Patients with MS treated with ocrelizumab, fingolimod, and no disease-modifying therapies and healthy controls were included. The number of interferon (IFN)-γ secreting SARS-CoV-2–specific T cells at multiple time points before and after 3 SARS-CoV-2 vaccinations were evaluated.Results In ocrelizumab-treated patients (N = 24), IFN-γ–producing SARS-CoV-2–specific T-cell responses were induced after 2 vaccinations with median levels comparable to healthy controls (N = 12) and patients with MS without disease-modifying therapies (N = 10). A third vaccination in ocrelizumab-treated patients (N = 8) boosted T-cell responses that had declined after the second vaccination, but did not lead to higher overall T-cell responses as compared to immediately after a second vaccination. In fingolimod-treated patients, no SARS-CoV-2–specific T cells were detected after second (N = 12) and third (N = 9) vaccinations.Discussion In ocrelizumab-treated patients with MS, a third SARS-CoV-2 vaccination had no additive effect on the maximal T-cell response but did induce a boost response. In fingolimod-treated patients, no T-cell responses could be detected following both a second and third SARS-CoV-2 vaccination.