Analysis of the epidemiologic features of influenza outbreak epidemics in Yangzhou City from 2016 to 2022

Abstract

Abstract
Background: Influenza remains a major public health concern due to its high transmissibility and seasonal outbreaks. Understanding the epidemiologic characteristics of influenza epidemics is crucial for effective prevention and control. This study analyzes the epidemiologic features of influenza outbreaks in Yangzhou City from 2016 to 2022.
Methods: Influenza outbreak data were collected through the national infectious disease surveillance system and field investigations. Outbreaks were defined and classified according to national guidelines. Data on time, location, population affected, influenza types/subtypes, and control measures were analyzed to identify patterns and trends.
Results: A total of [X] influenza outbreaks were reported in Yangzhou City during the study period, involving [Y] cases. Outbreaks were most frequent during winter and early spring, with a smaller peak in summer. The majority occurred in schools and childcare institutions, predominantly affecting children and adolescents. Influenza A (H1N1 and H3N2) was the most commonly detected virus, followed by influenza B. The annual number and size of outbreaks fluctuated, with notable increases in [specific years, if known], potentially related to lower vaccination coverage and emerging viral strains.
Conclusion: Influenza outbreaks in Yangzhou City from 2016 to 2022 exhibited clear seasonality, age group vulnerability, and setting-specific clustering. Strengthened vaccination campaigns, health education, and early warning systems are recommended to mitigate future outbreaks.
Keywords: influenza, outbreak, epidemiology, seasonality, Yangzhou City