Overall study status is changed to "Terminated" due to low enrollment

The purpose of this study is to evaluate the effects of Ceftaroline Fosamil versus Vancomycin plus Aztreonam in treatment of patients with complicated bacterial skin and soft tissue infections.

A Phase III, Multicentre, Randomised, Double-Blind Comparative Study to Evaluate the Efficacy and Safety of Ceftaroline Fosamil (600 mg every 8 hours) Versus Vancomycin Plus Aztreonam in the Treatment of Patients with Complicated Bacterial Skin and Soft Tissue Infections With Evidence of Systemic Inflammatory Response or Underlying Comorbidities

Inclusion Criteria:

• Male or female, aged 18 years or older - Complicated skin and skin structure infection (cSSTI) - Infection of sufficient severity to warrant hospitalization - Infection of sufficient severity such that it is expected to require at least 5 days of intravenous antibiotic therapy. patients must have a positive culture for MRSA that has been obtained from the skin infection site and/or blood samples at any time within the 72hrs before the first dose.

Exclusion Criteria:

• Received systemic antibacterial drugs for greater than 24 hours within 96 hours prior to first dose of study drug - Uncomplicated skin and skin structure infections, skin infections suspected to be caused by viral or fungal pathogens - Diabetic foot infections, decubitus ulcers, ulcers due to peripheral vascular disease - Infection caused by human or animal bites, sternal wound infections, bone infection or arthritis due to an infection, critical limb ischemia of the affected limb - Chronic liver disease or severe impaired renal function, severe low white blood cell count, burns on greater than 15% of total body surface area, necrotizing skin infection, amputation required of primary site of infection, sustained shock

The investigator agrees not to use such Confidential study information and not to disclose them to any other third parties, except that the undersigned shall not be prevented from using or disclosing information: (a) which by written records was previously known; (b) which is now public knowledge, (c) which is lawfully obtained by the undersigned from sources who have a lawful right to disclose such information.