IMMUNE PROTECTION AGAINST ENTEROTOXINOGENIC E. COLI: SEARCH FOR SYNERGY BETWEEN ANTIBODIES TO ENTEROTOXIN AND SOMATIC ANTIGENS

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Abstract
The protective effect against intestinal challenge with enterotoxinogenic (ent +) E. coli of enterotoxin antibodies alone and in combination with various antibacterial antibodies has been studied in rabbits. Both antibodies against E. coli heat-labile enterotoxin (LT) and cholera toxin were equally effective against different serotypes of ent+E. coli. Antiserum to purified homologous E. coli lipopolysaccharide (LPS) as well as to cross-reactive LPS structures (Re LPS and Common antigen) contained protective antibodies which increased the protection obtained with anti-enterotoxin. Antiserum to whole bacteria acted synergistically with anti-LT against homologous and sometimes also against heterologous E. coli. This synergy remained after complete absorption of the LPS antibodies from the antibacterial serum.