COVID-19 in multiple sclerosis patients and risk factors for severe infection.

"Declaration of competing interest Dr. Adil Javed, MD, PhD has received consultation fee or honoraria from Serono, Sanofi-Genzyme, Novartis, Biogen, Celgene and Genentech. Dr. Mirela Cerghet MD, PhD has received grants for participation in clinical trials from Merck/EMD Serono, Roche, Novartis, Biogen, and Actelion. Dr. Eva Bernitsas MD has received grants from Novartis, Roche/Genetech, Medimmune, Chugai, ADAMAS, TG TG Therapeutics, Sanofi/Genzyme, and Mallinckrodt. She is also a consultant for Biogen, BMS, EMD Serono, and Roche/Genetech. Dr. Robert Lisak MD has received grants for participation in clinical trials from Ra Pharmaceuticals, Alexion, Argenx, Catalyst, Novartis, Medimmune, Genetech, Teva Pharmaceuticals and Mallinckdrot. He is also a consultant for Mallinckdrot, Novartis, Argenx, GLG Consulting, Alpha Sites Consulting, Schlesinger Group Consulting, Alpha Sites Consulting, Guidepoint Consulting, Informa Consulting, Haven Consulting, Cello Health Bioconsulting, and kc2 Medical Communications."

"Funding There was no funding involved in the conduct of this study."