Enterotoxigenic Escherichia coli isolated from food

Area of Science:

• Food safety
• Microbiology
• Public health

Background:

• Escherichia coli (E. coli) is a common bacterium found in food.
• Some E. coli strains produce toxins that can cause illness.
• Identifying all potentially harmful E. coli in food is crucial for public health.

Purpose of the Study:

• To determine the prevalence of enterotoxigenic E. coli in food of animal origin in the United States.
• To assess if these enterotoxigenic strains belong to known enteropathogenic serotypes.

Main Methods:

• Collected 240 E. coli isolates from animal-origin foods in the US.
• Utilized adrenal cell assays, rabbit ileal loops, and infant mouse assays to detect enterotoxigenicity.
• Serotyped the identified E. coli isolates.

Main Results:

• Approximately 8% of the 240 E. coli isolates were enterotoxigenic.
• The enterotoxigenic E. coli strains belonged to diverse serotypes.
• These serotypes were not among the commonly recognized enteropathogenic E. coli serotypes.
• Standard laboratory methods would likely miss these enterotoxigenic strains.

Conclusions:

• Enterotoxigenic E. coli are present in US animal-origin foods.
• These bacteria possess unique serotypes, evading conventional detection methods.
• The presence of these undetected enterotoxigenic E. coli strains represents a significant public health concern.