Two Peaks of Seasonal Influenza Epidemics -China, 2023

作     者：Yiran Xie Shuxia Lin Xiaoxu Zeng Jing Tang Yanhui Cheng Weijuan Huang Jiandong Li Dayan Wang 

作者机构：National Key Laboratory of Intelligent Tracking and Forecasting for Infectious DiseaseNational Institute for Viral Disease Control and PreventionChinese Center for Disease Control and PreventionBeijingChina. 

出 版 物：《China CDC weekly》 (中国疾病预防控制中心周报（英文）)

年 卷 期：2024年第6卷第36期

页      面：905-910页

核心收录：

学科分类：1004[医学-公共卫生与预防医学(可授医学、理学学位)] 100401[医学-流行病与卫生统计学] 10[医学] 

基　　金：Supported by the National Key Research and Development Program of China(grant number 2022YFC2303800) 

主　　题：prevailing surveillance Influenza 

摘      要：Introduction:Influenza is a communicable respiratory disease that causes annual epidemics and occasional unpredictable *** study examines the occurrence of two unexpected influenza peaks within the year ***:Influenza-like illness(ILI)data were reported,and specimens of ILI were collected by designated surveillance *** cases were confirmed using real-time reverse transcription polymerase chain reaction(rRT-PCR)testing conducted at national surveillance network *** data were then submitted to the Chinese Influenza Surveillance Information ***:From December 2022 to January 2023,influenza activity was minimal until a spring epidemic began in February,peaking in late *** outbreak spread from the north to the south,with A(H1N1)pdm09 being the predominant strain and A(H3N2)also circulating *** positivity rate in northern and southern provincial-level administrative divisions(PLADs)reached 60.0%(week 10)and 60.2%(week 13),respectively,before dropping to below 5%from May to ***,rates surged starting in week 41 in the south and week 44 in the north,peaking at 54.4%(week 50)and 44.0%(week 49),respectively,and remained high until the end of 2023.A(H3N2)became the prevailing strain,with a notable increase in B/Victoria lineage viruses from December,resulting in two peaks during the 2023 influenza ***:The pattern of the influenza epidemic shifted due to the coronavirus disease 2019(COVID-19)outbreak and is gradually returning to its usual seasonal and intensity *** is,therefore,crucial to continuously strengthen influenza surveillance,enhance the influenza surveillance network,and lay the groundwork for advancing integrated surveillance of multiple pathogens in China.