Fig. 1

Agglutinating antibodies developed by RB51 vaccinated cattle after challenge with virulent B. abortus 2308. Left panel, evolution of the percentage of Standard agglutination (SAT) and Rose Bengal (RBT) reactor cows vaccinated at 24 months of age after challenge (arrow) at 6–7 months of pregnancy (data from [61]). Right panel, evolution of SAT titers in RB51 vaccinated heifers at the indicated age after challenge (arrow) (D.O. delivery outcome, either parturition or abortion) (adapted from [62])