ETIDIOH - NEW

  Abstract Limited information is available on the impact of non-pharmaceutical interventions (NPIs) and immune debt on influenza during COVID-19 . This retrospective population-based research examined the effect of the COVID-19 pandemic on the prevalence of influenza-like illness (ILI) cases and influenza positive cases in Sichuan Province . Interrupted time series analysis (ITS) was conducted using data gathered from surveillance hospitals throughout 21 cities , including information on patients diagnosed with ILI and positive nucleic acid testing. Subsequent to the implementation of NPIs, there was a notable temporary reduction in both the incidence of ILI cases and confirmed influenza cases, decreasing by 94.7% and 98.0%, respectively (P<0.001). The weekly trend in influenza-positive cases was notable (+4.1%/week, P=0.001). Following the execution of the second-phase intervention, the fluctuations in the transient changes of ILI patients and influenza-positive cases varied ;...

  10 December 2025 Situation at a glance Seasonal influenza (‘the flu’) is an acute respiratory infection caused by influenza viruses that circulate globally and year-round.  It can cause illness ranging from mild to severe , sometimes resulting in hospitalization or death.  Seasonal influenza activity has increased globally in recent months, with an increased proportion of seasonal influenza A(H3N2) viruses being detected.  This rise coincides with the onset of winter in the northern hemisphere and an increase in acute respiratory infections caused by influenza and other respiratory viruses typically observed at this time of year.  Although global activity remains within expected seasonal ranges , early increases and higher activity than typical at this time of year have been observed in some regions.  Seasonal influenza viruses, including A(H3N2) viruses, continually evolve over time.  Since August 2025, there has been a rapid increase of A(H3N2) J.2...