Respiratory Syncytial Virus Seasonality, Beijing, China, 2007-2015

Area of Science:

• Pediatric Infectious Diseases
• Virology
• Epidemiology

Background:

• Pneumonia is a significant cause of childhood hospitalization globally.
• Understanding the seasonality of respiratory syncytial virus (RSV) infection is crucial for public health interventions.
• Beijing, China, presents a unique setting for studying viral seasonality due to its distinct climate.

Observation:

• A study analyzed 4,225 hospitalized children with pneumonia in Beijing between July 2007 and June 2015.
• RSV season was defined as weeks with >10% positive PCR tests.
• Eight distinct RSV seasons were identified over the study period.

Findings:

• The average RSV season in Beijing lasted 33 weeks, from mid-October (week 41) to mid-May (week 20).
• 97% of all RSV-positive cases occurred within these defined seasons.
• RSV seasons initiated 3-5 weeks earlier and extended approximately 6 weeks longer in years dominated by RSV subgroup A compared to subgroup B.

Implications:

• Monitoring shifts between RSV subgroups A and B can improve predictions of RSV transmission onset.
• PCR-based testing offers a flexible method for determining RSV seasonality, particularly in regions with less established surveillance systems.
• Findings can inform targeted public health strategies and resource allocation for managing pediatric RSV infections in China and similar settings.