Management of Bacterial Gastroenteritis in Children

Supportive Care

Reduced‑osmolarity oral rehydration solution is the first‑line treatment for mild‑to‑moderate dehydration and should be initiated immediately. 4
Intravenous lactated Ringer’s or normal saline is reserved for severe dehydration, shock, altered mental status, or failure of oral rehydration. 6
Breastfeeding should be continued throughout the illness and an age‑appropriate diet resumed promptly after rehydration. 5
Loperamide and other antimotility agents are contraindicated in all children younger than 18 years with acute diarrhea. 4
Ondansetron may be administered to children older than 4 years to improve oral rehydration tolerance. 5
Probiotic preparations such as Lactobacillus GG or Saccharomyces boulardii can shorten the duration of symptoms. 5
Zinc supplementation is recommended for children 6 months to 5 years in regions with high zinc‑deficiency prevalence. 5

Empiric antibiotics are indicated only for (a) infants younger than 3 months with suspected bacterial etiology, (b) bacillary dysentery suggestive of Shigella, (c) international travelers with fever ≥ 38.5 °C or sepsis, (d) immunocompromised children with severe illness and bloody diarrhea, and (e) suspected enteric fever with sepsis features after obtaining cultures. [1][8]
Antibiotics should be avoided in most immunocompetent children with either bloody or watery diarrhea. 8
Antibiotics are contraindicated for STEC O157 and other Shiga‑toxin‑2‑producing strains because of the risk of hemolytic‑uremic syndrome. 1
Antibiotics are not recommended for persistent watery diarrhea lasting 14 days or more. 8
Asymptomatic household contacts should not receive antibiotic prophylaxis. 4

For infants younger than 3 months or children with neurologic involvement, a third‑generation cephalosporin (e.g., ceftriaxone) is recommended. 8
For older children, azithromycin is preferred, guided by local susceptibility patterns and travel history. 8

Shigella – First‑line azithromycin; treatment is advised for all confirmed cases due to high transmissibility. 8
Campylobacter – Azithromycin is the preferred agent; antibiotics are reserved for severe early disease, as most infections resolve without them. [8][7]
Non‑Typhoidal Salmonella – Ceftriaxone or ciprofloxacin may be used when treatment is warranted; indications include infants <3–6 months, immunocompromised status, underlying conditions (e.g., sickle‑cell disease), systemic infection or bacteremia, and prolonged diarrhea. Routine treatment is discouraged because antibiotics can prolong the carrier state. [8][3]
Typhoid/Paratyphoid (Enteric Fever) – Initiate broad‑spectrum therapy, obtain blood, stool, and urine cultures before treatment, then narrow therapy based on susceptibility and local resistance patterns. 4
Shiga‑toxin‑producing E. coli (STEC) – Antibiotics are contraindicated for O157 and Shiga‑toxin‑2‑producing strains; for non‑O157 STEC without Shiga toxin 2, evidence is insufficient and antibiotics are generally avoided. [1][4]

Do not prescribe antibiotics empirically for bloody diarrhea in immunocompetent children unless the high‑risk criteria are met. 1
Never treat suspected or confirmed STEC infection with antibiotics because of the increased risk of hemolytic‑uremic syndrome. [1][4]
Avoid antimotility agents in any child under 18 years with acute diarrhea. 4

Reassess fluid and electrolyte status and nutritional condition in children with ongoing symptoms. 7
If diarrhea persists for 14 days or more, evaluate for non‑infectious etiologies such as lactose intolerance, inflammatory bowel disease, or irritable bowel syndrome. 7
Routine follow‑up stool testing is not required for clinical management, though public‑health authorities may request it before a child returns to childcare. 1
Modify or discontinue antibiotic therapy promptly when the causative organism is identified. 4