Isolation and immunogenicity of Campylobacter fetus subsp. fetus from an abdominal aortic aneurysm.

A Campylobacter fetus strain was isolated from an abdominal aortic aneurysm in a 56-year-old man who had no significant chronic illness except arteriosclerosis. The strain was identified on the basis of the usual taxonomic markers and fatty acid profiles. The patient's immunological status regarding Campylobacter fetus was studied by Western blot. The strong immune response observed against the 99 kDa protein of the strain confirms that the S-layer protein is the immunodominant antigen of Campylobacter fetus.