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Separation of Immune Cell Subpopulations in Peripheral Blood Samples from Children with Infectious Mononucleosis
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Human monocytic ehrlichiosis in children.

Gordon E Schutze1, Steven C Buckingham, Gary S Marshall

  • 1University of Arkansas for Medical Sciences, Arkansas Children's Hospital, Little Rock, AR, USA. schutze@bcm.edu

The Pediatric Infectious Disease Journal
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Summary

Human monocytic ehrlichiosis (HME) in children presents with fever, headache, and rash. Limited data exists, highlighting the need for further research into this tick-borne illness.

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Area of Science:

  • Pediatric Infectious Diseases
  • Tick-borne Illnesses
  • Ehrlichiosis Epidemiology

Background:

  • Human monocytic ehrlichiosis (HME) is a significant tick-borne disease caused by Ehrlichia chaffeensis.
  • Existing data on HME in children is primarily from limited case reports and small series.
  • Understanding HME's clinical spectrum in pediatric populations remains crucial.

Purpose of the Study:

  • To characterize the clinical presentation and laboratory findings of HME in children.
  • To identify common signs, symptoms, and laboratory abnormalities associated with pediatric HME.
  • To evaluate the impact of early diagnosis and treatment on patient outcomes.

Main Methods:

  • Retrospective review of medical and laboratory records from 32 pediatric HME patients across 6 sites in the Southeastern U.S. 'tick belt' region.
  • Data abstraction included demographics, clinical history, and laboratory results.
  • Bivariate statistical comparisons utilized Fisher exact and Wilcoxon rank sum tests.

Main Results:

  • Fever (100%), headache (69%), and rash (66%) were prevalent symptoms. Common laboratory findings included thrombocytopenia (94%) and elevated liver enzymes (AST 90%, ALT 74%).
  • A significant percentage of patients (22%) required intensive care, with 12.5% needing ventilatory and blood pressure support.
  • Delayed antirickettsial therapy, particularly with sulfonamides, was associated with prolonged illness and hospitalization.

Conclusions:

  • Despite recognition for nearly 20 years, the clinical course of HME in children is not well-understood.
  • Diagnosis remains infrequent, even in endemic areas, suggesting an underestimation of the disease burden.
  • Further research is essential to elucidate the full spectrum of HME in children, including asymptomatic infections.