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Pathogenicity and convalescent excretion of Campylobacter in rural Egyptian children

M R Rao1, A B Naficy, S J Savarino

  • 1Epidemiology Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892, USA. mr8u@nih.gov

American Journal of Epidemiology
|July 12, 2001
PubMed

Insights

Campylobacter infections cause severe diarrhea and dehydration in young Egyptian children. Natural immunity doesn't develop in the first six months, posing challenges for developing effective vaccines.

Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Public Health

Background:

  • Campylobacter infections are often overlooked in developing nations due to a perceived lack of severe disease beyond infancy.
  • Understanding the epidemiology of Campylobacter infections in young children is crucial for public health interventions.

Purpose of the Study:

  • To investigate the incidence, severity, and age-specific risk factors of Campylobacter diarrhea in Egyptian children under three years old.
  • To assess the protective effect of natural infection against subsequent Campylobacter infections in early childhood.

Main Methods:

  • A prospective cohort study involving 397 Egyptian children under three years old, observed between 1995 and 1998.
  • Data collection included twice-weekly monitoring for diarrheal episodes and clinical assessment of severity.
  • Statistical analysis was performed to determine age-specific incidence rates and risk factors.

Main Results:

  • The incidence of Campylobacter diarrhea was 0.6 episodes per child-year, with 13% of episodes causing severe dehydration.
  • Incidence was highest in infants under 12 months (0.9/year for <6 months, 1.5/year for 6-12 months).
  • First-time Campylobacter infection was associated with diarrhea in all children, but subsequent infections only caused diarrhea in those under 6 months.

Conclusions:

  • Campylobacter infection poses a significant disease burden in young Egyptian children, particularly infants.
  • Poor hygiene and household animals are identified risk factors, highlighting the need for improved sanitation.
  • The lack of protective immunity after natural infection in early infancy presents a major hurdle for Campylobacter vaccine development.

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