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J. Med. Microbiol. -- Vol. 51 (2002), 1050-1054
© 2002 Society for General Microbiology
ISSN 0022-2615

BACTERIAL PATHOGENICITY

Production of serum antibodies that recognise epitopes located on the R3 region of Escherichia coli core lipopolysaccharides by patients infected with strains of enterohaemorrhagic E. coli

HENRIK CHART, THOMAS CHEASTY and GERALDINE A. WILLSHAW

Laboratory of Enteric Pathogens, Division of Gastrointestinal Infections, Central Public Health Laboratory, 61 Colindale Avenue, London NW9 5HT

Corresponding author: Dr H. Chart (e-mail: hchart{at}phls.org.uk).

Received 5 Feb. 2002; accepted 26 June 2002.

Antibody–antigen cross-reactions were examined with sera from patients with Escherichia coli O157 infection and lipopolysaccharide (LPS) purified from a range of enterohaemorrhagic E. coli (EHEC) including those belonging to serogroups O26, O103, O111, O145 and O157. Six of 10 patients infected with an O157 EHEC produced serum antibodies that cross-reacted with common LPS-core epitopes, which were expressed by 23 of 33 strains of EHEC examined. These common LPS-core epitopes were also present on strains of E. coli O26 which did not produce verocytotoxin. These cross-reacting antibodies did not influence the basic immunoblotting procedures used for the routine serodiagnosis of infections with E. coli O157.




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