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Threshold for empirical methicillin-resistant Staphylococcus aureus coverage (MRSA). Percentage of MRSA in the community necessary to change the default corneal ulcer treatment to include MRSA coverage.
| % MRSA | USA, N (%) | International, N (%) | p Value |
| 5%–15% | 14 (14) | 15 (42) | p<0.001 |
| 15%–30% | 30 (29) | 7 (19) | |
| 30%–50% | 6 (6) | 5 (14) | |
| >50% | 7 (7) | 1 (3) | |
| Default MRSA coverage | 46 (45) | 8 (22) |
