PT - JOURNAL ARTICLE AU - Christenson, Stephanie A. TI - Let’s start from the very beginning AID - 10.1126/scitranslmed.aao0977 DP - 2017 Aug 02 TA - Science Translational Medicine PG - eaao0977 VI - 9 IP - 401 4099 - http://stm.sciencemag.org/content/9/401/eaao0977.short 4100 - http://stm.sciencemag.org/content/9/401/eaao0977.full AB - Methicillin-resistant Staphylococcus aureus likely evolved before the introduction of methicillin into clinical use.