Table 3. Median survival time following inoculation with a virulent type A strain after a previous inoculation with a type B strain or a sham inoculation with PBS.
| Strains | Median | Survival range |
|---|---|---|
| KY-B/MA-A1b | 7.5 | 7–13 |
| KY-B/WY-A2 | 10 | 5–10 |
| OR-B/MA-A1b * | 7 | 5–8 |
| OR-B/WY-A2 | 14 | 7–14 |
| PBS/MA-A1b | 4 | 4 |
| PBS/WY-A2 | 7 | 5–7 |
Survival time for rabbits challenged only with MA-A1b was less than those inoculated first with KY/MA (p = 0.008, log rank test).
*Rabbit #19 is not included in this table; thus, the median and range for the OR/MA group is based only on 5 rabbits.