Female 9-to-12-week-old CD1 mice (Charles River Laboratories, Inc., Wilmington, MA) were used for virulence studies. S. aureus challenge strains were cultured in TSB medium, and 9 or 10 mice per bacterial strain were inoculated with approximately 1 × 108 CFU via tail vein injection. Survival was monitored for at least 4 days postchallenge. Data were analyzed using GraphPad Prism 6 software (GraphPad Software, Inc., La Jolla, CA). Kaplan-Meier survival curves were plotted, and statistical significance was assessed with log rank (Mantel-Cox) tests. All animal work was performed in strict accordance with approved Institutional Animal Care and Use Committee (IACUC) protocols at an American Association of Laboratory Animal Science (AALAS)-accredited facility (Pfizer, Inc., Pearl River, NY).
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