| Code | Definition | Number of Accessions |
| 1 | LOW SUSCEPTIBILITY | 92 |
| 2 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 94 |
| 3 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 215 |
| 4 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 136 |
| 5 | MEDIUM SUSCEPTIBILITY | 134 |
| 6 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 142 |
| 7 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 228 |
| 8 | (1 = LOW SUSCEPTIBILITY, 9 = HIGH SUSCEPTIBILITY) | 4 |
| 9 | HIGH SUSCEPTIBILITY | 2002 |