In a 13-year-old boy with 2 days of watery diarrhea, vomiting, abdominal pain, fever, and recent consumption of chili chicken, what is the most likely diagnosis and appropriate treatment?

Diagnosis and Treatment

This is acute infectious gastroenteritis (food poisoning), most likely bacterial given the history of chili chicken consumption, and treatment should focus on oral rehydration therapy without empiric antibiotics.

Diagnosis

The clinical presentation strongly suggests acute bacterial gastroenteritis (food poisoning):

• 2-day history of watery diarrhea, vomiting, abdominal pain, and fever
• Clear epidemiological link to potentially contaminated food (chili chicken consumed 2 days prior)
• Timeline consistent with bacterial pathogens like Salmonella, Campylobacter, or E. coli

The history of chili chicken intake is particularly relevant, as poultry is a common source of Campylobacter and Salmonella infections 1, 2. The presence of fever with diarrhea suggests an inflammatory/invasive pathogen, though this remains a self-limited illness in most cases 3.

Treatment Approach

Primary Treatment: Rehydration

Oral rehydration solution (ORS) is the cornerstone of management 4:

• Assess hydration status first through physical examination (check for decreased skin turgor, dry mucous membranes, decreased urine output, altered mental status)
• For mild to moderate dehydration: Give reduced osmolarity ORS until clinical dehydration is corrected 4
• For severe dehydration (signs of shock, altered mental status): Use intravenous fluids (lactated Ringer's or normal saline) 4
• Continue ORS to replace ongoing stool losses until diarrhea and vomiting resolve 4

Antiemetic Consideration

Ondansetron may be given to facilitate tolerance of oral rehydration in this 13-year-old with vomiting 4. This is appropriate for children >4 years of age with acute gastroenteritis associated with vomiting (weak, moderate evidence).

Nutrition

• Resume age-appropriate diet immediately after rehydration is completed 4
• Do not withhold food; early refeeding is recommended 5

Antibiotics: NOT Recommended

Empiric antimicrobial therapy is NOT recommended for this patient 4:

• The 2017 IDSA guidelines explicitly state that in most people with acute watery diarrhea without recent international travel, empiric antimicrobial therapy is not recommended (strong, low evidence)
• Exceptions are only for immunocompromised patients or young infants who are ill-appearing—this 13-year-old does not meet these criteria
• Antibiotics should only be considered if there is bloody diarrhea with severe illness, which is not described here 6

Critical caveat: If E. coli O157:H7 (STEC) is suspected, antibiotics must be avoided as they increase risk of hemolytic uremic syndrome 4.

What NOT to Use

Avoid antimotility drugs (like loperamide)—these should not be given to children <18 years of age with acute diarrhea 4. This is particularly important when fever is present, as antimotility agents can worsen inflammatory diarrhea.

Adjunctive Options

• Probiotics (Lactobacillus rhamnosus GG, Lactobacillus reuteri, or Saccharomyces boulardii) may be offered to reduce symptom severity and duration 4, 5
• Zinc supplementation is not indicated unless the child shows signs of malnutrition or lives in a zinc-deficient region 4

Monitoring and Follow-up

• Monitor for signs of worsening dehydration
• If symptoms persist beyond 7 days or worsen (bloody diarrhea develops, high fever persists, severe abdominal pain), consider stool culture and reassess for need for antibiotics 2
• Ensure proper hand hygiene to prevent transmission to family members 4

Summary Algorithm

1. Assess hydration status → Mild/moderate dehydration
2. Give ORS as first-line therapy
3. Consider ondansetron if vomiting prevents oral intake
4. Resume normal diet once rehydrated
5. Do NOT give antibiotics empirically
6. Do NOT give loperamide (contraindicated in children)
7. Monitor for complications requiring escalation of care