[Table/Fig-2]:
Titers of cases as determined by STAT (n=35).
| Titers (I.U./ml) | Number of cases |
|---|---|
| 20 | 01 |
| 160 | 09 |
| 320 | 02 |
| 640 | 05 |
| 1280 | 06 |
| 2560 | 05 |
| 5120 | 05 |
| 10240 | 02 |
| Total=35 |
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