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Evaluation of a real-time hospital surveillance system for respiratory syncytial virus, Ontario, Canada, 2022–2023
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Evaluation of a real-time hospital surveillance system for respiratory syncytial virus, Ontario, Canada, 2022–2023
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Evaluation of a real-time hospital surveillance system for respiratory syncytial virus, Ontario, Canada, 2022–2023
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Journal Article
Evaluation of a real-time hospital surveillance system for respiratory syncytial virus, Ontario, Canada, 2022–2023
2025
Overview
Respiratory syncytial virus (RSV) surged in the 2022-2023 respiratory season after low activity during the pandemic. To monitor the RSV season in real time and support healthcare planning, Ontario introduced daily hospital bed census reporting of RSV hospitalizations by age group (0-17, 18-64, 65 years and older).
To assess the completeness and quality of the newly introduced real-time surveillance compared to end-of-season ICD-10 coded hospitalization discharge abstract data (DAD) from November 22, 2022, to March 31, 2023.
Respiratory syncytial virus hospitalizations from both data sources were compared to RSV laboratory positivity to assess concordance with overall RSV activity. A longitudinal comparison by age group was assessed by time-lagged cross-correlation of the daily submission data versus DAD data, including cross correlation coefficients for each time lag, confidence bound and the highest correlation value.
Both data sources followed trends in RSV positivity. Data by age groups showed an early peak of paediatric admissions followed by a peak in adult and older adult hospitalizations. Daily surveillance consistently underestimated hospitalizations with a peak of 430 beds by DAD on January 7, 2023, versus 322 beds (75%) for daily reporting on the same day. The maximum correlation coefficient values were 0.67 (all ages), 0.57 (0-17 years), 0.66 (18-64 years) and 0.63 (65 years and older).
Implementation of daily hospital reporting provided accurate trending in RSV hospitalizations by age group to inform within season healthcare and public health planning.
Publisher
Public Health Agency of Canada
Subject
