biostudies-literatureUnknown226(Suppl 2)Movva NAstraZenecaSanofi<h4>Background</h4>Surveillance in 2020-2021 showed that seasonal respiratory illnesses were below levels seen during prior seasons, with the exception of interseasonal respiratory syncytial virus (RSV).<h4>Methods</h4>Electronic health record data of infants aged <1 year visiting the Duke University Health System from 4 October 2015 to 28 March 2020 (pre-COVID-19) and 29 March 2020 to 30 October 2021 (COVID-19) were assessed. International Classification of Diseases-Tenth Revision (ICD-10) codes for RSV (B97.4, J12.1, J20.5, J21.0) and bronchiolitis (RSV codes plus J21.8, J21.9) were used to detail encounters in the inpatient (IP), emergency department (ED), outpatient (OP), urgent care (UC), and telemedicine (TM) settings.<h4>Results</h4>Pre-COVID-19, 88% of RSV and 92% of bronchiolitis The Journal of infectious diseasesS175-S183https://www.ebi.ac.uk/biostudies/studies/S-EPMC9377040biostudies-literatureRespiratory Syncytial Virus During the COVID-19 Pandemic Compared to Historic Levels: A Retrospective Cohort Study of a Health System.PMC9377040White MHintze BWolf ZFryzek JPCarr SMalcolm WFSendak MPMovva NReichert HKaminski TWood CTFisher KSuh MNelson CBfalseRespiratory Syncytial Virus During the COVID-19 Pandemic Compared to Historic Levels: A Retrospective Cohort Study of a Health System.<h4>Background</h4>Surveillance in 2020-2021 showed that seasonal respiratory illnesses were below levels seen during prior seasons, with the exception of interseasonal respiratory syncytial virus (RSV).<h4>Methods</h4>Electronic health record data of infants aged <1 year visiting the Duke University Health System from 4 October 2015 to 28 March 2020 (pre-COVID-19) and 29 March 2020 to 30 October 2021 (COVID-19) were assessed. International Classification of Diseases-Tenth Revision (ICD-10) codes for RSV (B97.4, J12.1, J20.5, J21.0) and bronchiolitis (RSV codes plus J21.8, J21.9) were used to detail encounters in the inpatient (IP), emergency department (ED), outpatient (OP), urgent care (UC), and telemedicine (TM) settings.<h4>Results</h4>Pre-COVID-19, 88% of RSV and 92% of bronchiolitis 2022-01-01T00:00:00Z2022 Aug2025-04-27T02:58:43.611Z2024-10-18T22:56:44.879ZS-EPMC93770403596886810.1093/infdis/jiac220