Enterotoxigenic Escherichia coli (ETEC) (ETEC)

Enterotoxigenic Escherichia coli (ETEC) is a Gram-negative bacterial pathogen and a leading cause of secretory diarrhea, particularly in children in developing nations and travelers to endemic areas (StatPearls, 2023). The bacterium colonizes the small intestine using specialized surface proteins called colonization factors (CFs) and produces two primary types of enterotoxins: heat-labile (LT) and heat-stable (ST) toxins (Nature Reviews Microbiology, 2019). These toxins disrupt intestinal fluid homeostasis by increasing intracellular levels of cyclic AMP or GMP, resulting in the secretion of water and electrolytes into the gut lumen (PubMed, 2021). While ETEC is a whole organism rather than a single molecular target, its toxins and adhesins are the primary focus for therapeutic and prophylactic strategies. Current clinical management relies on oral rehydration and the use of antibiotics like ciprofloxacin or azithromycin to reduce the duration and severity of symptoms (CDC, 2024). Ongoing research is focused on developing multivalent vaccines that target the most prevalent colonization factors and the LT toxin to provide broad protection against diverse ETEC strains (The Lancet Infectious Diseases, 2021).

Other names

Traveler's diarrhea E. coliEnterotoxigenic E. coliETEC

Inhibition of DNA gyrase and topoisomerase IV by fluoroquinolones; inhibition of the 50S ribosomal subunit by macrolides; inhibition of bacterial RNA polymerase by rifamycins; and neutralization of heat-labile toxins and colonization factors by vaccines.