← Issue №10/ week of Sep 6, 2026/Colorectal

Rectal bleeding in early infancy: a warning sign of necrotizing enterocolitis that should not be overlooked in high-risk infants.

From GI Signals issue №10: what this paper found, what it changes, and where it sits against the current standard of care, reviewed by Simon Mathews, MD.

Colorectal retrospective · n=91 · Sep 5, 2026 · Dig Liver Dis · IF 4.2

Rectal bleeding in early infancy: a warning sign of necrotizing enterocolitis that should not be overlooked in high-risk infants.

Epidemiologypediatricepidemiology
Clinical takeawayFor infants younger than 3 months presenting with rectal bleeding, especially those born preterm or with congenital heart disease (CHD), maintain a high index of suspicion for necrotizing enterocolitis (NEC) and consider prompt evaluation, as 78.1% of NEC cases with CHD required surgery.
What it foundIn a retrospective series of 91 infants younger than 3 months with rectal bleeding, necrotizing enterocolitis (NEC) was the most common diagnosis (35.1%), followed by isolated rectal bleeding (22.0%) and infectious gastroenteritis (16.5%).
ContextThis study challenges the common assumption that rectal bleeding in early infancy is typically benign (e.g., from anal fissures or milk protein allergy) by identifying necrotizing enterocolitis as the single most frequent cause (35.1%) in a hospital-based cohort of high-risk infants, particularly those with CHD and preterm birth.
Refinessuggested applicable standard· Infectious Diseases Society of America (IDSA), '2017 Infectious Diseases Society of America Clinical Practice Guidelines for the Diagnosis and Management of Infectious Diarrhea,' 2017

Decision at staketriage of acute diarrhea or rectal bleeding in infants under 3 months

Triage acute diarrhea (<14 days) by duration and severity: most is viral, self-limited, and needs only supportive care with hydration and no testing. When indicated, treat adults with a fluoroquinolone such as ciprofloxacin or with azithromycin, chosen by local susceptibility and travel history (strong, moderate); infants <3 months with suspected bacterial etiology instead receive a third-generation cephalosporin (e.g., ceftriaxone) or azithromycin.

From our summary of this standard, unedited — the part the paper bears on. marks omitted text. Our wording, not the guideline's; read the source for its own text.

Our full summary of this standard

Triage acute diarrhea (<14 days) by duration and severity: most is viral, self-limited, and needs only supportive care with hydration and no testing. Reserve stool testing (culture, Shiga toxin EIA, CDI two-step, GI multiplex PCR, O&P/antigens) for severe, bloody, febrile, immunocompromised, elderly, recent-antibiotic, or persistent (≥7 d) cases, and admit for sepsis, severe dehydration, AKI, or toxic appearance. Empiric antibiotics are not indicated for most acute watery diarrhea, and are not recommended even for bloody diarrhea in immunocompetent patients while awaiting stool results (IDSA strong, low); reserve empiric therapy for the specific indications: ill immunocompetent patients with fever documented in a medical setting, abdominal pain, and bloody diarrhea/bacillary dysentery presumptively due to Shigella; recent international travelers with temperature ≥38.5°C and/or signs of sepsis (weak, low); and immunocompromised patients with severe illness and bloody diarrhea (strong, low). When indicated, treat adults with a fluoroquinolone such as ciprofloxacin or with azithromycin, chosen by local susceptibility and travel history (strong, moderate); infants <3 months with suspected bacterial etiology instead receive a third-generation cephalosporin (e.g., ceftriaxone) or azithromycin. Avoid antibiotics in suspected STEC/EHEC (Shiga toxin 2-producing or O157; strong, moderate), and avoid loperamide/antimotility agents in EHEC, CDI, or any febrile/inflammatory (dysenteric) diarrhea.

Infectious Diseases Society of America (IDSA), '2017 Infectious Diseases Society of America Clinical Practice Guidelines for the Diagnosis and Management of Infectious Diarrhea,' 2017 · reviewed 2026-07-20 ↗
De Rose DU … Di Pede A · Digestive and Liver Disease : Official Journal of the Italian Society of Gastroenterology and the Italian Association for the Study of the Liver · IF 4.2 · PubMed ↗Permalink
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