The RODEO 1 study is designed to determine the safety and efficacy of partial oral treatment of IE compared with traditional full-length parenteral treatment. Our primary objective is to demonstrate that in patients with left-sided multi-susceptible Staphylococcus who have received at least 10 days of IV antibiotic treatment with or without valvular surgery, a switch to an oral combination of rifampicin and fluoroquinolones between Day 10 and Day 28 after initiation of the IV antibiotic treatment, is not inferior to the continuation of the conventional IV antibiotic treatment regarding to treatment failure within 3 months after the end of antibiotic treatment.