Table 1.

Protection of mice against virulent E. rhusiopathiae strain by graded doses of YS-1

ImmunizationaTime of challengebImmunizing dose (CFU)No. of survivors/totalc
YS-121 days2 × 108 10/10
2 × 107 10/10
2 × 106 10/10
2 × 105 10/10
2 × 104 10/10
BHI-T800/10
YS-12 mo2 × 108 7/7
BHI-T800/7
YS-13 mo2 × 108 7/7
BHI-T800/8
  • a Mice were immunized s.c. with 0.1 ml of bacterial suspension. Controls were injected with 0.1 ml of broth medium.

  • b Time after immunization.

  • c Mice were challenged s.c. with 100 LD50 of virulent E. rhusiopathiaeFujisawa-SmR.