Table I.
SBA titers of sera raised against different strains in assays against homologous or heterologous strains
| SBA titer against
|
|||
|---|---|---|---|
| Sera raised versus | S3 | S3∷R | R3 |
| S3 | 1,024 | <8 | <8 |
| SR | 1,024 | <8 | <8 |
| R3 | 1,024 | <8 | <8 |
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