This is a multicenter, randomized, double-blind study of the efficacy and safety of iclaprim compared to vancomycin for the treatment of skin and skin structure infections.

This is a multicenter, randomized, double-blind study of the efficacy and safety of IV iclaprim compared to IV vancomycin. Patients will receive either iclaprim or vancomycin for 5 to 14 days. Patients will be evaluated daily up to early time point (ETP), then every 48 to 72 hours through the end of treatment. Patients will also be evaluated at the test of cure (TOC) visit (7 to 14 days post-EOT), and will have a Late Follow-Up (LFU) visit (28 to 32 days post-first dose).

Inclusion Criteria:

1. written informed consent;
2. ≥18 years of age;
3. a bacterial infection of the skin with a lesion size area of at least 75 cm2;
4. a major cutaneous abscess, cellulitis/erysipelas, and/or wound infections;
5. the presence of purulent or seropurulent drainage or at least three signs and symptoms of infection (discharge, erythema, swelling, warmth, or pain).

Exclusion Criteria:

1. severely impaired arterial blood supply such that amputation of the infected anatomical site is likely;
2. infected diabetic foot ulcers;
3. infected decubitus ulcers;
4. necrotizing fasciitis or gangrene;
5. uncomplicated skin or skin structure infection;
6. infections associated with a prosthetic device;
7. suspected or confirmed osteomyelitis;
8. conditions requiring systemic anti-microbial treatment, prophylaxis, or suppression therapy.