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Section 3. Summaries of Infectious Diseases
Escherichia coli Diarrhea
(Including Hemolytic-Uremic Syndrome)Clinical Manifestations
Etiology
Epidemiology
Diagnostic Tests
Treatment
Isolation of the Hospitalized Patient
Control Measures
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Shiga toxin-producing E coli (STEC) organisms are associated with diarrhea, hemorrhagic colitis, hemolytic-uremic syndrome (HUS), and postdiarrheal thrombotic thrombocytopenic purpura (TTP). Shiga toxin-producing E coli O157:H7 is the prototype and the most virulent member of this E coli pathotype. Illness caused by STEC often begins as nonbloody diarrhea but usually progresses to diarrhea with visible or occult blood. Severe abdominal pain is typical; fever occurs in less than one third of cases. Severe infection can result in hemorrhagic colitis.
Diarrhea caused by enteropathogenic E coli (EPEC) is watery and often is severe enough to result in dehydration and even death. Chronic EPEC diarrhea characteristically is persistent and leads to growth retardation. Illness occurs almost exclusively in neonates and children younger than 2 years of age and predominantly (but not exclusively) in resource-limited countries, either sporadically or in epidemics.
Diarrhea caused by enterotoxigenic E coli (ETEC) is a brief (15 days), self-limited illness of moderate severity, typically with watery stools and abdominal cramps.
Diarrhea caused by enteroinvasive E coli (EIEC) is similar clinically to infection caused by Shigella species. Although dysentery can occur, diarrhea usually is watery without blood or mucus. Patients often are febrile, and stools may contain leukocytes.
Enteroaggregative E coli (EAEC) organisms cause watery diarrhea, predominantly in infants and young children in resource-limited countries, but all ages can be affected. Enteroaggregative E coli organisms have been associated with prolonged diarrhea (>14 days). Asymptomatic infection can be accompanied by a
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