Evaluate Safety/Tolerability in Portuguese Participants With RRMS Transitioning From Current Therapy

The primary objective of the study is to evaluate safety and tolerability as defined by the frequency of the adverse events (AEs) of flu-like symptoms (FLS) \[chills, pyrexia, myalgia, and asthenia\], injection site reactions (ISRs), and injection site reaction pain (ISR-P), over 24 weeks of treatment (the active comparator period) with PLEGRIDY 125 microgram (μg) subcutaneous (SC) every 2 weeks versus current SC IFN-β therapy in participants with Relapsing Remitting Multiple Sclerosis (RRMS).