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. 2017 Aug 10;12(8):e0182821. doi: 10.1371/journal.pone.0182821

Fig 4. Multi-step resistance selection of compounds 1, 2, linezolid, and ciprofloxacin against methicillin-resistant S. aureus USA400 (NRS123).

Fig 4

Bacteria were serially passaged over a 14-day period and the broth microdilution assay was used to determine the minimum inhibitory concentration of each compound against MRSA after each successive passage. A four-fold shift in MIC would be indicative of bacterial resistance to the test agent.