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Epidemiology and aetiology of acute bronchiolitis in Hong Kong infants

R Y Sung1, R C Chan, J S Tam

  • 1Department of Paediatrics, Prince of Wales Hospital, Chinese University of Hong Kong, Shatin, N.T.

Epidemiology and Infection
|February 1, 1992
PubMed

Insights

This study on acute bronchiolitis in Hong Kong children found Respiratory Syncytial Virus (RSV) to be the most common cause. Unlike Western countries, a summer peak incidence was observed, with most cases having a benign clinical course.

Area of Science:

  • Pediatrics
  • Infectious Diseases
  • Epidemiology

Background:

  • Acute bronchiolitis is a common pediatric respiratory infection.
  • Understanding its epidemiology and etiology is crucial for public health.
  • Previous studies have primarily focused on Western populations.

Purpose of the Study:

  • To describe the epidemiological, clinical, and virological features of acute bronchiolitis in Hong Kong children.
  • To identify the primary etiological agents and seasonal patterns.
  • To compare findings with those from Western countries.

Main Methods:

  • Retrospective analysis of 1220 children admitted with acute bronchiolitis between 1985-1988.
  • Utilized direct immunofluorescence, virus culture, and serology for viral identification.
  • Clinical data including hospital stay, readmissions, and outcomes were recorded.

Main Results:

  • Respiratory Syncytial Virus (RSV) was the predominant cause (6.6% of pediatric admissions).
  • Average hospital stay was 5 days with no deaths; 10% experienced recurrent wheezing.
  • A distinct summer peak incidence was observed, contrasting with Western seasonal patterns.

Conclusions:

  • RSV is the leading cause of acute bronchiolitis in Hong Kong children.
  • The observed summer seasonality differs from Western trends, suggesting unique epidemiological factors.
  • While generally benign, recurrent wheezing and rare cases of bronchiolitis obliterans warrant attention.

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