Table 1.
Group information and treatment.
| Age of vaccination (days old) |
Age of challenge (days old) |
||||
|---|---|---|---|---|---|
| Group | Number | 1 | 40 | 131 | 157 |
| Control | 18 | - | - | - | - |
| Only vaccinated | 30 | Yes | Yes | Yes | - |
| Vaccinated + SP | 30 | Yes | Yes | Yes | Yes |
| Nonvaccinated + SP | 18 | - | - | - | Yes |
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