Table 2.

Passive protection of mice against virulent E. rhusiopathiae strain by the serum from mice immunized with strain YS-1

ImmunizationaTime of collection of serumb (day)No. of survivorsc
BHI-T800
YS-140
70
145
215
  • a Mice were immunized s.c. with 2 × 108 of bacteria in 0.1 ml of broth medium. Controls were injected with 0.1 ml of broth medium.

  • b Time of collection of the mouse serum after immunization with strain YS-1.

  • c Five mice were challenged s.c. with 100 LD50 of virulent E. rhusiopathiae Fujisawa-SmR opsonized with the serum for 30 min at 37°C.