[Erythrocyte diagnostic agents for detecting bacterial antigens of the genus Citrobacter].

Citrobacter antigenic and antibody erythrocyte diagnosticums, serogroups 1, 2, 3, 4, 5, 6, 7, 8, 11, 12, 13, and 22, have been developed. Tests with the use of these diagnosticums have proved to be highly sensitive and mainly group-specific. The antigen in the cellular form is best detected by means of the passive hemagglutination test and in the molecular form, by means of the neutralization test. The antibody-binding and agglutinating activities of strictly group-specific and cross-reacting O-antigenic determinants differ in their sensitivity to heating and to treatment with phenol. In the study of fecal samples taken from patients the above method for the detection of Citrobacter antigens has been shown to have high resolution.