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. 1985 Oct;50(1):255–261. doi: 10.1128/iai.50.1.255-261.1985

Experimental enterotoxin-induced Escherichia coli diarrhea and protection induced by previous infection with bacteria of the same adhesin or enterotoxin type.

C M Ahrén, A M Svennerholm
PMCID: PMC262165  PMID: 2864313

Abstract

The diarrheal response to an initial and a second infection with Escherichia coli expressing various enterotoxins (the heat-stable toxin [ST] alone or in combination with the heat-labile toxin [LT]) and colonization factor antigens (CFA/I, CFA/II, or E8775-type) was studied in the reversible tie adult rabbit diarrhea model. An initial infection with high doses (1 X 10(10) to 5 X 10(11) bacteria) of the various strains regularly induced diarrhea which was usually self-limiting (only 7 of 85 animals died). The diarrheal response to equally effective doses of different strains producing both ST and LT (ST/LT) did not differ significantly with serotype or colonization factor antigen. ST/LT-producing strains appeared to induce severe disease more regularly than ST-producing strains carrying the same adhesin. Previous infection with CFA/I-carrying, ST/LT-producing E. coli protected all animals reinfected with an otherwise highly diarrheogenic dose of the same strain as well as against challenge with a CFA/I-carrying, ST/LT-producing strain with different O-, K-, and H-antigens. Fecal excretion of bacteria was also significantly reduced in the protected animals, although not completely eliminated. When only one of the two antigens, CFA/I and LT, was shared by the immunizing and rechallenge strains, partial protection was evident consistent with independent antibacterial (anti-CFA) and antitoxic (anti-LT) immune mechanisms. Oral immunization with purified CFA/I significantly reduced fluid secretion in intestinal loops infected with CFA/I-carrying enterotoxigenic bacteria.

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Selected References

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