Epidemiologic characteristics of influenza outbreaks in Shaanxi Province, 2014-2023
10.3760/cma.j.cn112338-20240410-00182
- VernacularTitle:陕西省2014-2023年流感暴发疫情流行特征分析
- Author:
Bin CHEN
1
;
Jing XU
;
Ping MA
;
Ninan HE
;
Quan HAO
;
Yifan HE
;
Pengbo YU
;
Xuan FENG
;
Lei ZHANG
Author Information
1. 陕西省疾病预防控制中心病毒病预防控制所，西安 710054
- Keywords:
Influenza;
Outbreak;
Epidemiology characteristics;
Etiology
- From:
Chinese Journal of Epidemiology
2024;45(8):1120-1125
- CountryChina
- Language:Chinese
-
Abstract:
Objective:To analyze the epidemiological characteristics and pathogen spectrum of influenza outbreaks in Shaanxi Province from 2014 to 2023 and provide basis reference for strengthening regional influenza prevention and control.Methods:The data were collected from the Public Health Emergency Management Information System of the China Disease Prevention and Control Information System and the China Influenza Surveillance Information System. On-site epidemiological investigation information and etiological test results of influenza network laboratories reported in Shaanxi Province during 2014-2023 were collected, and descriptive analysis was conducted on the time, region, and location distribution of influenza outbreaks. SPSS 25.0 software was used for statistical analysis.Results:A total of 386 influenza outbreaks were reported in Shaanxi from 2014 to 2023, with a total attack rate of 1.81% (14 880/821 001). The epidemic peaks mainly occurred in winter and spring (November to March of the following year), and there was an alternating pattern of epidemic peaks in different years (the early peak was in December, and the late peak was in March of the following year). The epidemic areas were mainly concentrated in the Qinba Mountains of southern Shaanxi (209, 54.15%) and Guanzhong Plain (173, 44.82%). The epidemic places were mainly distributed in primary schools (239, 61.92%), and the differences of epidemic areas and places were statistically significant (all P<0.001). Influenza A(H3N2) viruses were the predominant pathogen in the outbreak (849, 57.76%), and influenza A(H3N2), B (Victoria) lineage and A(H1N1)pdm09 virus alternately dominated the epidemic peak in different years. Conclusions:The peak of influenza outbreaks in Shaanxi Province was winter and spring during 2014-2023. Primary schools in the Qinba Mountains of southern Shaanxi and Guanzhong Plain should be targeted for prevention and control. In the prevention and control programs, close attention should be paid to the changing trend of dominant strains. Effective intervention measures should be targeted to the high-incidence areas and seasons.
