| Code | Definition | Number of Accessions |
| 1 | LOW SUSCEPTIBILITY | 2 |
| 2 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 3 |
| 4 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 16 |
| 6 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 36 |
| 8 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 151 |
| 9 | HIGH SUSCEPTIBILITY | 223 |