From lockdown to recovery: changing patterns of viral infection severity in a pediatric cohort with asthma.

Background: Respiratory viruses such as rhinovirus and respiratory syncytial virus (RSV) are common triggers of asthma exacerbations in children. The COVID-19 pandemic introduced non-pharmaceutical interventions (NPIs) that altered viral circulation; however, their long-term effects on pediatric asthma outcomes remain unclear.

Objective: To evaluate how the epidemiology and severity of respiratory viral infections in children with asthma changed before, during, and after COVID-19-related NPIs.

Methods: We conducted a cross-sectional analysis of pediatric asthma patients (ages 4-18) with laboratory-confirmed respiratory viral infections from 2018 to 2024 at Arkansas Children's (AC) and AC Northwest (ACNW). Viral detection was performed using the BioFire® Respiratory Panel. Clinical severity was evaluated using a modified World Health Organization Ordinal Scale for Clinical Improvement (mWHO OSI). Patients were categorized by period (pre-NPI, NPI, post-NPI), viral type, rurality, and Childhood Opportunity Index (COI).

Results: This study included 9,391 pediatric asthma patients with laboratory-confirmed viral infections. RV/EV was the most common virus during all periods. Viral incidence decreased during NPIs but rebounded post-NPI with unusual seasonality. mWHO OSI scores declined over time (pre-NPI: 2.98; NPI: 2.49; post-NPI: 2.28), with significant reductions in hospitalizations, PICU admissions, and oxygen use (p < 0.0001). Severe disease (mWHO OSI 6-8) was infrequent. Rural and low-COI patients exhibited higher severity, although disparities narrowed post-NPI.

Conclusions: NPIs were associated with sustained reductions in asthma-related illness severity, even with increased viral detection post-pandemic. These findings highlight the long-term impact of public health measures on pediatric asthma outcomes and emphasize the need for ongoing surveillance of respiratory viruses and health disparities.