title: An immunoblotting procedure comprising O = 9,12 and H = d antigens as an alternative to the Widal agglutination assay.
abstract: OBJECTIVE
  To compare the established Widal agglutination assay with an immunoblotting procedure.
  
  
  METHODS
  110 sera were used to compare the established Widal agglutination assay with an immunoblotting procedure incorporating lipopolysaccharide (LPS) (O = 9,12) and flagellar (H = d) antigens.
  
  
  RESULTS
  Antibodies to the LPS antigens were detected in 18 sera by the Widal assay and in 37 by immunoblotting. Antibodies to the flagellar antigens were detected in 27 sera by Widal assay and in 25 by immunoblotting.
  
  
  CONCLUSIONS
  An immunoblotting procedure incorporating O = 9,12 LPS and H = d flagellar antigens was rapid and more sensitive than the established Widal agglutination assay for providing evidence of infection with S typhi.
authors: Laboratory of Enteric Pathogens, Central Public Health Laboratory, London, UK. hchart@phls.co.uk
authors: H
authors: H
authors: Chart
authors: L R
authors: LR
authors: Ward
authors: B
authors: B
authors: Rowe
mesh_terms: D000372:Agglutination Tests; D000907:Antibodies, Bacterial / Q000097:blood; D000942:Antigens, Bacterial / Q000276:immunology*; D004591:Electrophoresis, Polyacrylamide Gel; D005407:Flagella / Q000276:immunology; D006801:Humans; D015151:Immunoblotting / Q000379:methods*; D008070:Lipopolysaccharides / Q000276:immunology; D012485:Salmonella typhi / Q000276:immunology*; D014435:Typhoid Fever / Q000175:diagnosis*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D008070:Lipopolysaccharides