Question:
A 5-year-old child presents with acute gastroenteritis. Antibiotics should be used with caution in which infection as it may worsen hemolytic uremic syndrome (HUS)?
A 5-year-old child presents with acute gastroenteritis. Antibiotics should be used with caution in which infection as it may worsen hemolytic uremic syndrome (HUS)?
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STEC Colitis Rule: In bloody diarrhea suspected to be E. coli O157:H7, DO NOT give antibiotics or antimotility agents! Early aggressive IV volume expansion protects the kidneys against HUS.
Updated On: Sep 3, 2026
- Shigella flexneri
- Salmonella typhi
- Escherichia coli O157:H7
- Campylobacter jejuni
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The Correct Option is C
Solution and Explanation
Concept:
Typical (diarrhea-associated, $D^+$) Hemolytic Uremic Syndrome (HUS) is the leading cause of acute kidney injury in children, caused predominantly by Shiga toxin-producing Escherichia coli (STEC), most notably serotype O157:H7.
Antimicrobial therapy during the acute diarrheal prodrome is contraindicated due to its association with a significantly increased risk of developing full-blown HUS.
Explanation:
• E. coli O157:H7 produces potent Shiga toxins (Stx1 and Stx2) that bind to Gb3 receptors on endothelial cells, triggering endothelial injury, platelet-fibrin microthrombi formation, microangiopathic hemolytic anemia, thrombocytopenia, and renal failure.
• Treating STEC colitis with certain bactericidal antibiotics (especially fluoroquinolones, co-trimoxazole, and $\beta$-lactams) induces bacterial SOS DNA-repair pathways and bacterial cell lysis.
• This massive bacterial lysis releases vast quantities of preformed intracellular Shiga toxins into the intestinal lumen, enhancing systemic absorption into the circulation.
• Multiple prospective studies and meta-analyses have shown that antibiotic administration during STEC O157:H7 infection increases the relative risk of developing HUS by up to 2- to 17-fold.
• Therefore, in children presenting with acute bloody diarrhea where STEC is suspected, antibiotics and antimotility agents should be strictly avoided, and supportive fluid therapy with isotonic crystalloids is the cornerstone of management.
Final Answer:
Antibiotics are avoided and contraindicated in Escherichia coli O157:H7 gastroenteritis because they induce toxin release and worsen the risk and severity of Hemolytic Uremic Syndrome.
Typical (diarrhea-associated, $D^+$) Hemolytic Uremic Syndrome (HUS) is the leading cause of acute kidney injury in children, caused predominantly by Shiga toxin-producing Escherichia coli (STEC), most notably serotype O157:H7.
Antimicrobial therapy during the acute diarrheal prodrome is contraindicated due to its association with a significantly increased risk of developing full-blown HUS.
Explanation:
• E. coli O157:H7 produces potent Shiga toxins (Stx1 and Stx2) that bind to Gb3 receptors on endothelial cells, triggering endothelial injury, platelet-fibrin microthrombi formation, microangiopathic hemolytic anemia, thrombocytopenia, and renal failure.
• Treating STEC colitis with certain bactericidal antibiotics (especially fluoroquinolones, co-trimoxazole, and $\beta$-lactams) induces bacterial SOS DNA-repair pathways and bacterial cell lysis.
• This massive bacterial lysis releases vast quantities of preformed intracellular Shiga toxins into the intestinal lumen, enhancing systemic absorption into the circulation.
• Multiple prospective studies and meta-analyses have shown that antibiotic administration during STEC O157:H7 infection increases the relative risk of developing HUS by up to 2- to 17-fold.
• Therefore, in children presenting with acute bloody diarrhea where STEC is suspected, antibiotics and antimotility agents should be strictly avoided, and supportive fluid therapy with isotonic crystalloids is the cornerstone of management.
Final Answer:
Antibiotics are avoided and contraindicated in Escherichia coli O157:H7 gastroenteritis because they induce toxin release and worsen the risk and severity of Hemolytic Uremic Syndrome.
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