Passive hemagglutination technique for serotyping Campylobacter fetus subsp. jejuni on the basis of soluble heat-stable antigens

Abstract

Antigenic materials were extracted from C. fetus ssp. jejuni strains by heating bacterial suspensions in saline at 100.degree. C and by exposure to EDTA. The antigens were heat stable at 100.degree. C, capable of sensitizing sheep erythrocytes for agglutination in antisera and able to elicit production of specific antibody in rabbits; they occurred with different immunological specificities in 23 strains. Antisera against the 23 strains could be used for discriminating among isolates of the species when the passive hemagglutination technique was used for serotyping. Three serotypes were more common than others among a collection of human isolates.