TABLE 3.

Titers of antibodies against FMDV, protection ratios, and PD50 in swine

Group and no. of dpvaLPB-ELISA antibody titersLog10 virus-neutralizing antibody titersProtection ratio (%)c
Full dose
    0<1:4, <1:4, <1:4, <1:4, <1:4b5/5 (100)
    301:128, 1:90, 1:64, 1:128, 1:641.98, 1.74, 1.81, 2.11, 1.81
1/3 dose
    0<1:4, <1:4, <1:4, <1:4, <1:44/5 (80)
    301:45, 1:64, 1:90, 1:64, 1:221.81, 1.74, 1.68, 1.68, 1.38
1/9 dose
    0<1:4, <1:4, <1:4, <1:4, <1:42/5 (40)
    301:22, 1:11, 1:64, 1:22, 1:451.20, 1.08, 1.68, 1.38, 1.68
Negative
    0<1:4, <1:4, <1:40/3 (0)
    30<1:4, <1:4, <1:4
  • a dpv, days postvaccination.

  • b —, no detectable neutralizing antibodies to FMDV type O.

  • c The PD50 was 6.47.