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Hemolytic Uremic Syndrome Associated With Non-Shigatoxin-producing Infectious Agents: Expanding the Shigatoxin Theory
Werner Keenswijk1,2,3, Eva Degraeuwe2, Evelyn Dhont4
1Departments of Pediatrics, Pediatric Nephrology.
Abstract:
Diarrhea-associated hemolytic uremic syndrome (HUS) is usually associated with shigatoxin-producing Escherichia coli or shigella infections. We report 2 cases of HUS, respectively, caused by salmonella and Campylobacter jejuni infections. None of these bacteria produce shigatoxins, and the underlying mechanism of HUS development remains unknown. In streptococcus pneumoniae-associated HUS, bacterial neuraminidase cleaves neuraminic acid and causes exposure of Thomsen-Friedenreich cryptantigen on the cell surface of, for example, erythrocytes, which induces an inflammatory response caused by binding of preformed IgM. Both campylobacter and salmonella bacteria also produce neuraminidase, and HUS development could be explained by a similar mechanism.
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