Characterize Flu-like Symptoms in Relapsing Multiple Sclerosis Patients Transitioning From Non-Pegylated Interferon Beta (IFN-β) Therapies to Peginterferon Beta-1a (BIIB017)

The primary objective of this study is to determine the proportion of participants with relapsing multiple sclerosis who experience new and/or increased flu-like symptoms (FLS) after transitioning from nonpegylated IFN-β therapies to peginterferon beta-1a (BIIB017). Secondary objectives are: to determine the severity and frequency (measured by flu-like symptom score \[FLS-S\]) of FLS in these participants; to determine the duration (measured in number of hours) of FLS in these participants; to determine the effect of BIIB017 on other participant-reported outcomes, including treatment satisfaction (measured with the Treatment Satisfaction Questionnaire for Medication \[TSQM\]) and disability status (measured with the Patient Determined Disease Steps \[PDDS\]) over a 56-week period; to determine whether interferon-related FLS result in missed days of work/daily activities (e.g., absenteeism); to assess the use of additional medications (in addition to current medications used to treat FLS) to relieve BIIB017-related FLS; to determine the incidence of adverse events throughout the study period; to characterize the immunogenicity profiles of participants switching from prior IFN-β therapy to BIIB017.