Comparative 2DE analysis of
proteins and immunoblotting profile of non-specific reactions. A total of 13 immunoreactive spots of common antigens that responded to the negative sera from non-infected cattle (A) and positive sera of Y. enterocolitica
(B), and three types of sera from cattle after 3, 7 and 10 weeks of challenge with B. abortus were selected. The numbers represent the serial numbers of the immunoreactive proteins in immunoblot analyses.