Aj. Zambrano et al., PRELIMINARY-RESULTS FOR THE VACCINATION OF PREGNANT CATTLE WITH BRUCELLA-ABORTUS STRAIN-19 OR BRUCELLA-ABORTUS RB51, Archivos de medicina veterinaria, 27, 1995, pp. 119-123
As cattle are the most susceptible to Brucella abortus infections when
these animals are pregnant, a study was done to compare the effects o
f vaccine strains 19 and RB51. Three cows served as controls, six rece
ived 4x10(7) strain 19 subcutaneously into the neck and six received 5
x10(7) strain RB51 by the same route. Although one of the controls abo
rted, this was subsequently found to be due to a Staphylococcus aureus
infection. The pregnant cattle, that were vaccinated with strain 19,
showed sero-conversion and one cow aborted with B. abortus S19 isolate
d from the fetus. Pregnant cattle that received B. abortus RB51 neithe
r showed any sere-conversion nor any abortions.