Journal of Shandong University (Health Sciences) ›› 2026, Vol. 64 ›› Issue (8): 14-22.doi: 10.6040/j.issn.1671-7554.0.2025.1532

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Epidemiological characteristics of Japanese encephalitis in Jinan City from 2007 to 2024

FU Ping, XU Ying, WANG Qiong, LI Chuanbin, MA Yongsheng, HE Yujing, LIU Jiali, MU Zunlong, GENG Xingyi   

  1. Immunization Prevention Department, Jinan Center for Disease Control and Prevention, Jinan 250012, Shandong, China
  • Published:2026-08-14

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Abstract: Objective To analyze the epidemiological and clinical characteristics of Japanese encephalitis(JE)in Jinan City from 2007 to 2024, and to investigate the carriage status of JE virus in mosquitoes. Methods JE case data with permanent residence in Jinan City from 2007 to 2024 and mosquito specimen collection data in Jinan City from 2008 to 2024 were collected. Joinpoint regression was used to assess the long-term incidence trend, circular distribution analysis was applied to identify the peak incidence period, and descriptive analysis was conducted to characterize pregion distribution, population distribution, clinical features, 6-month follow-up information, and mosquito surveillance results. Results A total of 170 JE cases were reported in Jinan City from 2007 to 2024, with an average annual incidence of 0.14 per 100,000 population and a case fatality rate of 5.29%. No cases were reported in 2015, 2019, and 2021-2023. The overall incidence showed a downward trend, with a peak in 2013(incidence rate: 0.74 per 100,000). Regional distribution revealed higher incidence rates in Jiyang District and Zhangqiu District. The onset time was concentrated in August and September. Farmers accounted for the highest proportion of cases(46.47%), and the proportion of cases aged over 45 years increased significantly from 34.44% to 57.50%. Clinical manifestations were predominantly mild and moderate. Cases with unknown vaccination history accounted for 52.35%. The 6-month follow-up survey showed a sequelae rate of 9.41%, and most deaths occurred in individuals aged over 50 years. The minimum infection rate of JE virus in Jinan City from 2008 to 2024 was 2.36%. Conclusion The JE epidemic in Jinan City exhibits obvious seasonality, an increasing proportion of middle-aged and elderly patients, and typical clinical features. It is necessary to strengthen prevention and control in key areas and populations and to enhance early recognition of JE.

Key words: Japanese encephalitis, Epidemiological characteristics, Circular distribution method, Mosquito surveillance

CLC Number: 

  • R184
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