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. 1990 Sep;28(9):1906–1912. doi: 10.1128/jcm.28.9.1906-1912.1990

Monoclonal antibodies against the different subcomponents of colonization factor antigen II of enterotoxigenic Escherichia coli.

Y Lopez-Vidal 1, A M Svennerholm 1
PMCID: PMC268076  PMID: 1699969

Abstract

Monoclonal antibodies (MAbs) against the different coli surface antigens CS1, CS2, and CS3 of colonization factor antigen II (CFA/II) of enterotoxigenic Escherichia coli (ETEC) were generated by fusing F/O myeloma cells with spleen cells from BALB/c mice immunized with different preparations of purified CFA/II. Five hybrids that produced antibodies specific for CS1, CS2, or CS3 in high titer were cloned and propagated. All the anti-CS MAbs were of the immunoglobulin G1 isotype, and all gave single precipitation lines in immunodiffusion tests when reacting with CFA/II-positive E. coli extracts containing the corresponding CS factor. The binding of all the MAbs to solid-phase-bound CFA/II could be completely inhibited by purified CFA/II containing the corresponding CS factor. However, whereas one MAb against CS3 was inhibited by all of 18 different CFA/II-positive strains tested, another anti-CS3 MAb was inhibited by bacteria expressing CS1 and CS3 (CS1 + CS3 strains) or CS3 alone but not by CS2 + CS3 strains, suggesting antigenic differences in CS3 when expressed by different strains. Use of the anti-CS MAbs in slide agglutination, immunodiffusion, or a CFA inhibition enzyme-linked immunosorbent assay revealed differences in the relative distribution of the various CS factors of CFA/II in clinical ETEC isolates from different geographic areas. By using the anti-CS MAbs in an enzyme-linked immunosorbent assay-nitrocellulose replica method, CFA/II-positive colonies could be detected in stool cultures from infected animals without prior isolation of the ETEC organisms.

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Selected References

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