An 18-month-old child presents to the Emergency Department after a brief, generalized tonic clonic seizure.

الشرح

Core Concept:

*Shigella* is a highly virulent, invasive Gram-negative bacillus that causes bacillary dysentery. It invades the colonic mucosa, leading to intense inflammation, and can release neurotoxins or induce high fevers that precipitate neurological symptoms in young children.

Clinical Presentation:

• Symptoms: High fever, severe abdominal cramps, tenesmus, and frequent small-volume stools containing blood and mucus. Seizures (often complex febrile seizures) are a notorious complication in children.
• Complications: Dehydration, systemic toxicity, toxic megacolon, and Hemolytic Uremic Syndrome (HUS) (especially with *S. dysenteriae* type 1).

Diagnosis:

• First-line: Stool microscopy to identify fecal leukocytes and RBCs, confirming invasive diarrhea.
• Gold Standard: Stool culture demonstrating *Shigella* species, though molecular (PCR) stool panels are increasingly used for rapid diagnosis.

Management:

• Acute: Fluid and electrolyte resuscitation (oral or intravenous depending on severity). Antipyretics for fever control.
• Definitive/Long-term: Antibiotic therapy (e.g., Azithromycin, Ceftriaxone, or Ciprofloxacin depending on susceptibilities) is indicated to shorten the duration of illness and decrease fecal shedding. Avoid antidiarrheal agents, as they can worsen the disease.