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Bronchiolitis-associated hospitalizations among US children, 1980-1996
D K Shay1, R C Holman, R D Newman
1Respiratory and Enteric Viruses Branch, Division of Viral and Rickettsial Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, Atlanta, GA 30333, USA. dks4@cdc.gov
Insights
Hospitalizations for bronchiolitis in young children significantly increased from 1980 to 1996. Respiratory syncytial virus (RSV) likely caused over 50,000 infant hospitalizations annually, exceeding prior estimates.
Area of Science:
- Pediatric Infectious Diseases
- Epidemiology
- Public Health
Background:
- Respiratory syncytial virus (RSV) is a leading cause of lower respiratory tract infections in young children, particularly bronchiolitis.
- Existing national estimates of RSV-related hospitalizations are limited, necessitating updated data due to advancements in prophylaxis.
Purpose of the Study:
- To determine the rates of bronchiolitis-associated hospitalizations in children younger than 5 years.
- To estimate the number of current hospitalizations attributable to RSV infection.
Main Methods:
- Analysis of US National Hospital Discharge Survey data from 1980 to 1996.
- Focus on children under 5 hospitalized for bronchiolitis in short-stay, non-federal hospitals.
- Calculation of hospitalization rates by age and year.
Main Results:
- An estimated 1.65 million bronchiolitis hospitalizations occurred in children under 5 over 17 years.
- Hospitalization rates for infants (<1 year) with bronchiolitis increased 2.4-fold between 1980 and 1996.
- RSV was estimated to be associated with 51,240 to 81,985 annual infant hospitalizations for bronchiolitis during 1994-1996.
Conclusions:
- Infant hospitalization rates for bronchiolitis rose substantially between 1980 and 1996.
- The proportion of respiratory hospitalizations linked to bronchiolitis also increased significantly.
- RSV-associated infant hospitalizations for bronchiolitis may be higher than previously estimated for combined RSV bronchiolitis and pneumonia.
Context:
Respiratory syncytial virus (RSV) causes more lower respiratory tract infections, often manifested as bronchiolitis, among young children than any other pathogen. Few national estimates exist of the hospitalizations attributable to RSV, and recent advances in prophylaxis warrant an update of these estimates.
Objectives:
To describe rates of bronchiolitis-associated hospitalizations and to estimate current hospitalizations associated with RSV infection.
Design And Setting:
Descriptive analysis of US National Hospital Discharge Survey data from 1980 through 1996.
Participants:
Children younger than 5 years who were hospitalized in short-stay, non-federal hospitals for bronchiolitis.
Main Outcome Measure:
Bronchiolitis-associated hospitalization rates by age and year.
Results:
During the 17-year study period, an estimated 1.65 million hospitalizations for bronchiolitis occurred among children younger than 5 years, accounting for 7.0 million inpatient days. Fifty-seven percent of these hospitalizations occurred among children younger than 6 months and 81 % among those younger than 1 year. Among children younger than 1 year, annual bronchiolitis hospitalization rates increased 2.4-fold, from 12.9 per 1000 in 1980 to 31.2 per 1000 in 1996. During 1988-1996, infant hospitalization rates for bronchiolitis increased significantly (P for trend <.001), while hospitalization rates for lower respiratory tract diseases excluding bronchiolitis did not vary significantly (P for trend = .20). The proportion of hospitalizations for lower respiratory tract illnesses among children younger than 1 year associated with bronchiolitis increased from 22.2% in 1980 to 47.4% in 1996; among total hospitalizations, this proportion increased from 5.4% to 16.4%. Averaging bronchiolitis hospitalizations during 1994-1996 and assuming that RSV was the etiologic agent in 50% to 80% of November through April hospitalizations, an estimated 51, 240 to 81, 985 annual bronchiolitis hospitalizations among children younger than 1 year were related to RSV infection.
Conclusions:
During 1980-1996, rates of hospitalization of infants with bronchiolitis increased substantially, as did the proportion of total and lower respiratory tract hospitalizations associated with bronchiolitis. Annual bronchiolitis hospitalizations associated with RSV infection among infants may be greater than previous estimates for RSV bronchiolitis and pneumonia hospitalizations combined.
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