Objective To analyze the epidemiological and etiological characteristics of influenza in Yangzhou City.
Methods The described epidemiological method was used to analyze the influenza surveillance data and pathogen detection results in Yangzhou City from 2012 to 2021.
Results From 2012 to 2021, a total of 438 072 influenza-like illness (ILI) cases were reported in Yangzhou City, and ratio of ILI to outpatient emergency cases (ILI%) was 6.69%; the proportions of 0 to 4 years old group and 5 to 14 years old group were the largest in ILI. The ILI% plus positive rate of influenza nucleic acid test was used as an indicator reflecting influenza activity intensity, and the result showed that the epidemic period of influenza was mainly concentrated from December to March of next year, with a low prevalence status from 2012 to 2013 and 2020 to 2021, and an epidemic peak occurredfrom 2014 to 2019 (especially in 2019); the positive rate of influenza nucleic acid test was 9.61%. Seasonal H3N2 influenza was the most common disease type, followed by Victoria influenza B, new HIN1 influenza A, and Yamagata influenza B; all the results mentioned above were consistent with influenza outbreaks.
Conclusion In Yangzhou City, the influenza mostly occurs in winter and spring, with each pathogen type dominates alternately, and each epidemic cycle (2 to 4 years) has 2 to 3 types of dominant strains. Prevention departments should focus on infants and children, strengthen the guidance on epidemic prevention and control in schools, and continue to strengthen work of influenza vaccination.
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