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Epidemiology

RNA Viruses - Influenza A Virus: Crucial Findings on Age-Stratified Prevalence and Meteorological Factors

Strategic Insights

— 1 min read

A recent study published in the Journal of Translational Medicine has shed new light on the epidemiological characteristics of influenza A virus (IAV) infection across age groups, with crucial findings on age-stratified prevalence and meteorological factors. The study, conducted by researchers at the Women and Children's Hospital in Chongqing, analyzed data from 21,191 patient records spanning a five-year surveillance period. The study revealed significant differences in IAV positivity rates across demographic subgroups, with preschool children (ages 4-6) showing the strongest association with IAV infection.

Key Takeaways:

  • The overall IAV positivity rate was 13.79%, with marked differences across demographic subgroups.
  • Preschool children (ages 4-6) showed the strongest association with IAV infection (OR = 6.25, 95% CI: 4.98-7.85; RR = 5.14, 95% CI: 4.13-6.41; both P < 0.001).
  • Restricted cubic spline (RCS) models revealed a significant nonlinear effect of minimum temperature (<10.92 °C) and relative humidity levels (61.91-74.00%) on IAV transmission (all P < 0.05).
  • Logistic and Poisson regression analyses highlighted the importance of age, gender, and clinical diagnosis in characterizing IAV prevalence.
  • The study's findings emphasize the need for targeted public health interventions and sustained surveillance to reduce the burden of IAV-related respiratory infections and improve patient outcomes.

Statistics:

  • Overall IAV positivity rate: 13.79%
  • IAV positivity rate in preschool children (ages 4-6): 24.11% (OR = 6.25, 95% CI: 4.98-7.85; RR = 5.14, 95% CI: 4.13-6.41; both P < 0.001)
  • Minimum temperature: <10.92 °C
  • Relative humidity levels: 61.91-74.00%
  • Sample size: 21,191 patient records

Sources:

  • Epidemiological characteristics of influenza A virus infection across age groups: a longitudinal analysis based on gender and clinical diagnosis. Journal of Translational Medicine, 2025;23(1):1113.
  • Women and Children's Hospital, Chongqing Medical University, Chongqing, 401174, People's Republic of China
  • Bmc, Campus, 4 Crinan St, London N1 9XW, England (Publisher contact information for the Journal of Translational Medicine)

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