The study was withdrawn due to lack of an appropriate patient population.

The purpose of this study is to assess the safety and efficacy of ceftobiprole versus a comparator in hospitalized patients with bacteremia.

Ceftobiprole medocaril is a cephalosporin antibiotic with anti-MRSA (Methicillin-Resistant Staphylococcus aureus) activity. Ceftobiprole medocaril in not approved for the treatment of bacterial blood stream infections. S. aureus is a major human pathogen. It causes a wide range of serious infections, including skin and skin structure infections, infections of vascular devices and catheters, and infections of the heart and lungs, bones and joints, and deep tissues. Particularly challenging and difficult to treat are blood-borne infections (bacteremia). Bacteremic infections are prone to relapse and they are often complicated by metastatic seeding of sites throughout the body. MRSA strains are increasing in prevalence, incidence, and virulence. Moreover, the frequency of patients presenting with persistent MRSA bacteremia appears to be rising. The objective of the open label trial is to compare the effectiveness and safety of ceftobiprole versus a comparator in patients with MRSA and MSSA (methicillin-susceptible Staphylococcus aureus) in bacteremic patients. Patients who meet inclusion and exclusion criteria and consent to participate in the study will be randomly assigned to either ceftobiprole or comparator. The primary end point is time to bloodstream clearance of MRSA and MSSA in patients. Patients will be randomized to either ceftobiprole or comparator for 7 days.

Inclusion Criteria:

• Hospitalized patients with signs and symptoms suggestive of systemic staphylococcal infection as defined in the protocol
• Female patients must be postmenopausal (for at least 1 year), surgically sterile or practicing an effective method of birth control, male partner sterilization or, at the discretion of the investigator, abstinence, before entry and throughout the study and have a negative urine pregnancy test (confirmed with a negative serum pregnancy test) at screening.

Exclusion Criteria:

• Female patients who are pregnant or lactating
• Known or suspected hypersensitivity to beta-lactam antibiotics or any other study medications
• Receipt of vancomycin or other antistaphylococcal drug for > 2 calendar days prior to initiation of study drug
• Diagnosis of a catheter-related GPC-cl bacteremia at the time of study enrollment
• Clinical findings of left-sided endocarditis prior to enrollment or any time during study participation
• Requirement for surgery during the seven days of study therapy administration with the exception of surgery required to manage a complication of S. aureus bacteremia