title: Latex agglutination, counterimmunoelectrophoresis, and protein A co-agglutination in diagnosis of bacterial meningitis.
abstract: Specimens of cerebrospinal fluid from 201 patients with meningitis caused by Neisseria meningitidis groups A/B/C/135, Streptococcus pneumoniae (23 types), and Haemophilus influenzae type b were tested for the presence of specific bacterial antigens by latex agglutination, counterimmunoelectrophoresis (CIE), and protein A co-agglutination. Specific antigens were found in 75% of the specimens by latex agglutination and CIE, and in 60% of the specimens by protein A co-agglutination. Non-specific reactions in protein A co-agglutination were prevented by heating the specimens to 100 degrees C for a few minutes. The three methods are simple and quick to perform. The smallest amount of antiserum was used in protein A co-agglutination, but we found this method less sensitive. Latex agglutination and CIE proved to be equally sensitive, but the first method was easier to adopt in practice.
mesh_terms: D000372:Agglutination Tests; D003378:Counterimmunoelectrophoresis; D006801:Humans; D007841:Latex Fixation Tests; D008583:Meningitis, Haemophilus / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D008585:Meningitis, Meningococcal / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D008586:Meningitis, Pneumococcal / Q000134:cerebrospinal fluid / Q000175:diagnosis*; D013205:Staphylococcal Protein A / Q000276:immunology
chemical_list: D013205:Staphylococcal Protein A