(a) Breakdown of training samples
| Virus type | Recurrence within 1 year | Nonrecurrence within 1 year |
|---|---|---|
| B | 6 | 16 |
| C | 18 | 56 |
| Samples that are neither B type nor C type | 5 | 17 |
|
| ||
| Total number of samples | 29 | 89 |
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