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| Region | Number of isolated strains | Number of prtS+ strains | Percentage of prtS+ |
|---|---|---|---|
| Hokkaido | 109 | 31 | 28.4 |
| Tohoku | 11 | 6 | 54.5 |
| Kanto | 19 | 7 | 36.8 |
| Chubu | 9 | 5 | 55.6 |
| Kinki | 1 | 0 | 0.0 |
| Chugoku | 2 | 1 | 50.0 |
| Shikoku | 6 | 0 | 0.0 |
| Kyushu | 15 | 9 | 60.0 |
| Total | 172 | 59 | 34.3 |
