News-Medical -- Results of a new international phase 4 study of patients with nosocomial pneumonia due to proven methicillin-resistant Staphylococcus aureus (MRSA) demonstrated that the antibiotic Zyvox® (linezolid) achieved a statistically significantly higher clinical success rate compared with vancomycin for the primary endpoint. The ZEPHyR (Linezolid in the treatment of subjects with nosocomial pneumonia proven to be due to methicillin-resistant Staphylococcus aureus) study was the largest ever conducted in this population. These findings will be presented at the 48th Annual Meeting of the Infectious Diseases Society of America in Vancouver.