TABLE 1.
Experimental design used to test the efficacy of planned injection of PRRSV to protect pigs against subsequent exposure to PRRSV
| Groupa | Designation | Inoculum at 3 wks of age | Content of serum injected at 8 wks of ageb |
|---|---|---|---|
| 1 | L-VAC | None | Low |
| 2 | H-VAC | None | High |
| 3 | SDSU73-L-VAC | SDSU73c | Low |
| 4 | SDSU73-H-VAC | SDSU73c | High |
| 5 | Controls | None | None |
a
Each group had 10 pigs. The pigs in all groups were inoculated with strain VR2385 at 13 weeks of age.
b
PRRSV genomic copy numbers were determined by quantitative PCR. Low, approximately 102 PRRSV strain VR2385 genomic copies per 2 ml; high, approximately 105 PRRSV strain VR2385 copies per 2 ml.
c
Groups 3 and 4 received approximately 105 TCID50s of SDSU73 in a 2-ml volume.