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Algorithm for classification of S. aureus strains.
| Strain type | mecA | PVL | arcA | ST | SCCmec type | ||
|---|---|---|---|---|---|---|---|
| USA300 | MRSA | USA300 | + | + | + | Not done | Not Done |
| probable USA300 |
+ | + | − | 8 | IV | ||
| probable USA300 |
+ | − | + | 8 | IV | ||
| MSSA | probable USA300 |
− | + | − | 8 | NA | |
| probable USA300 |
− | + | + | 8 | NA | ||
| Anything other than the above is not USA300 | |||||||
| non USA300 | MRSA | + | − | − | 8 | IV | |
| + | +/− | +/− | 8 | Not SCCmec IV | |||
| + | − | − | NOT ST8 | any | |||
| + | + | − | NOT ST8 | any | |||
| + | − | + | NOT ST8 | any | |||
| MSSA | − | +/− | +/− | NOT ST8 | NA | ||
