Clustering of acute respiratory infection hospitalizations in childcare facilities

Area of Science:

• Pediatric infectious diseases
• Epidemiology
• Public health

Background:

• Childcare facilities are common settings for infectious disease transmission among young children.
• Acute respiratory infections (ARIs) are a leading cause of childhood hospitalization.
• Understanding transmission dynamics within childcare is crucial for prevention strategies.

Purpose of the Study:

• To determine the impact of a recent acute respiratory infection (ARI) hospitalization within a childcare facility on the risk of hospitalization for other children.
• To investigate how factors like child's age and gender, and the characteristics of the initially hospitalized child influence this risk.

Main Methods:

• A population-based prospective cohort study involving 436,434 Danish children aged 0-5 years from 1989-2004.
• Data were sourced from Danish national registers.
• Incidence rate ratios (IRRs) for ARI-related hospitalizations were calculated.

Main Results:

• A small proportion (1%) of ARI hospitalizations occurred within one month of another child being hospitalized in the same facility.
• Children in facilities with a recent ARI hospitalization had a 42% increased risk of hospitalization.
• The increased risk was significantly higher for younger children (0-2 years) and when the index case was also a younger child or a boy.

Conclusions:

• Clustering of ARI hospitalizations, though infrequent, disproportionately affects younger children (0-2 years) and facilities where the first hospitalized child was a boy.
• These findings highlight specific demographic groups within childcare settings that may require targeted public health interventions to mitigate ARI transmission.