RT Journal Article SR Electronic T1 Let’s start from the very beginning JF Science Translational Medicine FD American Association for the Advancement of Science SP eaao0977 DO 10.1126/scitranslmed.aao0977 VO 9 IS 401 A1 Christenson, Stephanie A. YR 2017 UL http://stm.sciencemag.org/content/9/401/eaao0977.abstract AB Methicillin-resistant Staphylococcus aureus likely evolved before the introduction of methicillin into clinical use.