Enteroaggregative Escherichia coli infection in a rabbit model

Area of Science:

• Microbiology
• Gastroenterology
• Infectious Diseases

Background:

• Enteroaggregative Escherichia coli (EAEC) is a significant cause of diarrheal disease worldwide.
• Understanding EAEC pathogenesis and host-pathogen interactions is crucial for developing effective treatments and prevention strategies.

Purpose of the Study:

• To establish and characterize a rabbit model for studying gut colonization by EAEC.
• To investigate the ability of different EAEC strains and isolates to colonize the gastrointestinal tract of adult rabbits.
• To examine the ultrastructural changes associated with EAEC infection in rabbits.

Main Methods:

• Oral inoculation of adult rabbits with characterized EAEC strains and clinical isolates.
• Monitoring of experimental animals for colonization and clinical signs (diarrhea).
• Necropsy and histological examination, including ultrastructural analysis of intestinal tissues.

Main Results:

• All tested EAEC strains and isolates successfully colonized both the small and large intestines of rabbits.
• Specific isolates showed transient colonization in the small intestine followed by persistence in the large intestine.
• Ultrastructural examination revealed invasion of lymphoid follicles, including M cells, by EAEC, a novel finding.

Conclusions:

• Adult rabbits with normal gut flora can be successfully colonized by oral EAEC infection.
• The rabbit model is suitable for studying EAEC gut colonization and associated pathological changes.
• EAEC exhibits invasive properties within the gut-associated lymphoid tissue, contributing to its pathogenesis.