Enteropathogenic E. coli (EPEC)
Before modern sanitation, it killed infants in nurseries. Enteropathogenic E. coli is the classic cause of infantile diarrhea in developing regions — it doesn’t make classic toxins; it remodels the gut lining itself, flattening the absorptive surface.
Taxonomy & characteristics
- Enteropathogenic E. coli (EPEC); defined by attaching-and-effacing lesions (eae gene, bundle-forming pili) — it glues itself to intestinal cells and destroys microvilli.
- Typical EPEC (human-only) vs atypical EPEC (animals and humans); typical strains drive infant outbreaks.
- Growth characteristics like other E. coli (approx 7–46°C, pH ~4.4–9).
- Illness: watery diarrhea in infants and young children, sometimes prolonged; dehydration is the danger.
Sources & high-risk foods
- Reservoir: humans (typical EPEC); animals for atypical strains.
- High-risk: weaning foods, infant formula prepared with unsafe water, contaminated water.
Control measures
- Safe water for formula and weaning-food preparation.
- Hygiene in childcare and feeding: handwashing, clean utensils, excluding ill caregivers from food prep.
- Breastfeeding promotion — the single best infant protection where EPEC circulates.
Diagnosis and surveillance
EPEC is diagnosed by detecting its virulence genes (eae, bfp) rather than by serotype — modern labs use PCR panels that distinguish EPEC from ETEC, STEC, and other pathotypes in one run. This matters because traditional culture can’t tell them apart, and the public-health response differs by pathotype. In developing regions, EPEC remains a leading bacterial cause of infant diarrhea, though improved water and sanitation have reduced its burden where implemented. For food safety programs, EPEC rarely drives specific controls beyond general fecal-contamination prevention — safe water, hygienic preparation of infant foods, and breastfeeding promotion do the heavy lifting.
In food safety practice, EPEC seldom gets its own control measures — it rides along with general fecal-contamination prevention. But its infant-food relevance deserves explicit mention in hazard analyses for baby-food operations: safe water for reconstitution, hygienic preparation areas, and preparation-to-consumption time limits. Where EPEC surveillance exists, it’s usually within broader diarrheagenic E. coli monitoring rather than standalone programs.
Sources: WHO; CDC; FDA Bad Bug Book.