The immune response to ?X 174 in man. II. Primary and secondary antibody production in patients with Crohn's disease

Abstract
10 patients with Crohn's disease in various states of activity have been injected with 3.3×109 plaque-forming units of the bacteriophage ϕX 174, as a test for their capacity to produce antibodies. 9 patients had a completely normal primary and secondary antibody response. One patient had higher levels of preimmunization antibodies than have been encountered in normal subjects and developed a secondary (IgG) response to the first dose of antigen. We conclude that there is no evidence of a general disturbance of antibody-producing capacity in subjects with Crohn's disease.