European Journal of Biology and Medical Science Research (EJBMSR)

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Mechanisms of Immunity to Escherichia Coli O157:H7 In Albino Rats: Role Of Homologous Antibodies


The role of antibodies in conferring protection against infection caused by Escherichia coli O157:H7 in albino rats was carried out in this study. Antibody against E. coli O157:H7 of known titre was raised actively and used to passively protect some sets of rats intraperitoneally. Antibody titre was determined using tube agglutination test. At different intervals, starting from 30 minutes to 168 hours, the liver, spleen and ileum of actively, passively immunized and unimmunized rats were dissected out and the number of trapped E. coli O157:H7 was counted in these selected organs using standard microbiological techniques. The highest recovery of the organism was seen in unimmunized rats followed by the actively immunized rats. The least recovery was seen in the passively immunized rats. The spleen trapped more of the organism compared to the liver and ileum throughout the experiment. From this investigation therefore, passively raised antibodies to E. coli O157:H7 play a significant role by causing a reduction in the number of trapped E. coli O157:H7 in the organs examined. It is conceivable therefore that in case of an outbreak of infection caused by this organism, administration of preformed antibodies against E. coli O157:H7 to infected individuals, that is, passive immunity will reduce the severity of the infection and also the spread of the infection in the community.

Keywords: Antibody, E. coli O157:H7, Ileum, Immunization, Liver, Spleen

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