1.Analysis of impact of host plants on quality of Taxilli Herba based on widely targeted metabolomics.
Dong-Lan ZHOU ; Zi-Shu CHAI ; Mei RU ; Fei-Ying HUANG ; Xie-Jun ZHANG ; Min GUO ; Yong-Hua LI
China Journal of Chinese Materia Medica 2025;50(12):3281-3290
This study aims to explore the impact of host plants on the quality of Taxilli Herba and provide a theoretical basis for the quality control of Taxilli Herba. The components of Taxilli Herba from three different host plants(Morus alba, Salix babylonica, and Cinnamomum cassia) and its 3 hosts(mulberry branch, willow branch, and cinnamon branch) were detected by widely targeted metabolomics based on ultra-high performance liquid chromatography-tandem mass spectrometry(UPLC-MS/MS). Principal component analysis(PCA), orthogonal partial least squares discriminant analysis(OPLS-DA), and Venn diagram were employed for analysis. A total of 717 metabolites were detected in Taxilli Herba from the three host plants and the branches of these host plants by UPLC-MS/MS. The results of PCA and OPLS-DA of Taxilli Herba from the three different host plants showed an obvious separation trend due to the different effects of host plants. The Venn diagram showed that there were 32, 8, and 26 characteristic metabolites in samples of Taxilli Herba from M. alba host, S. babylonica host, and C. cassia host, respectively. It was found by comparing the characteristic metabolites of Taxilli Herba and its hosts that each host transmits its characteristic components to Taxilli Herba, so that the Taxilli Herba contains the characteristic components of the host. The Kyoto Encyclopedia of Genes and Genomes(KEGG) pathway analysis showed that the differential metabolites of Taxilli Herba from the three hosts were mainly enriched in flavonoid biosynthesis, arginine and proline metabolism, and glycolysis/gluconeogenesis pathways. Furthermore, the differential metabolites enriching pathways of Taxilli Herba from the three hosts were different depending on the host. In a word, host plants have a significant impact on the metabolites of Taxilli Herba, and it may be an important factor for the quality of Taxilli Herba.
Metabolomics/methods*
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Drugs, Chinese Herbal/chemistry*
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Chromatography, High Pressure Liquid
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Tandem Mass Spectrometry
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Quality Control
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Salix/chemistry*
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Cinnamomum aromaticum/metabolism*
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Principal Component Analysis
2.Early clinical outcomes of 3D-printed individualised customised prostheses in hip revision combined severe bone defect.
Hong-Ping WANG ; Ming-You WANG ; Xiao-Qin YANG ; Zhuo-Dong TANG ; Xun-Zhou SONG ; Yu-Ping LAN
China Journal of Orthopaedics and Traumatology 2025;38(2):163-169
OBJECTIVE:
To explore the early clinical outcomes of 3D printed individualised customised prostheses for in hip revision in patients with combined severe bone defects.
METHODS:
Twenty-two patients from January 2021 to May 2023 underwent hip revision using 3D printed personalised customised prostheses were retrospective analyzed, including 10 males and 12 females, age 28 to 78 with a mean of (58.9±12.8) years old. All of patients were combined with severe bone defects (Parprosky type Ⅲ). Among of them, 9 patients had periprosthetic infections and 13 patients had aseptic prosthesis loosening. All patients were treated with a 3D printed personalised prosthesis protocol, patients with the periprosthetic infection received a second stage revision after infection control. The operation time, preoperative waiting time, intraoperative and postoperative complications were recorded, and the clinical efficacy were evaluated at the final follow-up using the visual analogue scale (VAS) for pain, the Harris hip score.
RESULTS:
One patient was lost to follow-up and the remaining 21 patients were followed up for 10 to 15 with a mean of (12.91±1.44) months after surgery. All patients completed surgery as planned, with an operative time of 135 to 390 with a mean of (165.4±39.3) minutes and a preoperative waiting time of 7 to 16 with a mean of (10.5±3.3) days. Regarding patient complications:one patient had a severe intraoperative periprosthetic femoral fracture due to the combination of severe osteoporosis; one patient had an intraoperative greater trochanteric femur fracture. At the latest follow-up, all patients had good position of the custom-made prosthesis and no loosening of the prosthesis;all patients had good wound healing and no local redness or swelling. The total Harris score at the final follow-up (85.86±7.04) was significantly improved compared to the preoperative (44.86±2.36), P<0.001. The VAS at the last follow-up (2.19±0.87) was significantly improved compared with preoperative (7.41±0.96), P<0.001.
CONCLUSION
The clinical efficacy of 3D-printed personalised customised prosthesis in combined severe bone defect hip revision is satisfactory, but due to the increased preoperative waiting time of the patients and certain risks, certain indications should be mastered when applying in the clinic.
Humans
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Male
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Female
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Printing, Three-Dimensional
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Middle Aged
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Aged
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Adult
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Retrospective Studies
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Hip Prosthesis
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Arthroplasty, Replacement, Hip
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Reoperation
;
Prosthesis Design
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Treatment Outcome
3.Comparison of application and efficacy of domestic HURWA and imported Smith & Nephew Cori robots in total knee arthroplasty.
Ming-You WANG ; Zhuo-Dong TANG ; Yu-Ping LAN ; Heng XIAO ; Ming-Li WANG ; Xun-Zhou SONG ; Hong-Ping WANG
China Journal of Orthopaedics and Traumatology 2025;38(10):1027-1036
OBJECTIVE:
Investigation on the clinical application of HURWA robot and Smith & Nephew Cori robot in total knee arthroplasty(TKA).
METHODS:
A retrospective analysis was performed on 84 patients with knee osteoarthritis who underwent robotic-assisted TKA (RATKA) between June 2023 and March 2025. According to the different robotic systems used, the patients were divided into the domestic HUARUN robotic-assisted total knee arthroplasty group (HRATKA group) and the Smith & Nephew Cori robotic-assisted total knee arthroplasty group (CRATKA group). There were 42 patients in the HRATKA group, including 16 males and 26 females; the age ranged from 56 to 73 years old, with an average of (64.70±8.30) years old;the body mass index (BMI) was (25.10±2.30) kg·m-2;21 cases were on the right side and 21 cases on the left side;in terms of Kellgren-Lawrence(K-L) classification, there were 15 cases of Grade Ⅲ and 27 cases of Grade Ⅳ;the disease duration ranged from 3 to 25 years, with an average of (15.5±7.5) years. The CRATKA group also included 42 patients, with 14 males and 28 females;the age ranged from 58 to 74 years old, with an average of (65.60±7.50) years old;the BMI was (24.50±2.70) kg·m-2; 20 cases were on the right side and 22 cases on the left side;regarding K-L classification, there were 11 cases of Grade Ⅲ and 31 cases of Grade Ⅳ;the disease duration ranged from 2 to 26 years, with an average of (16.5±8.8) years. Collect general data of all patients, including age, gender, height, weight, surgical site, K-L classification, incision length, and operation time. To evaluate prosthesis position, compare the frontal tibia component (FTC) angle, lateral femoral component (LFC) angle, lateral tibia component (LTC) angle, and frontal femoral component angle between the two groups of patients after surgery. Measure the deviation of the hip-knee-ankle (HKA) angle to assess lower limb alignment. Additionally, compare the following indicators between the two groups:Knee Society Score (KSS), Visual Analogue Scale (VAS) for pain, knee range of motion (ROM), hemoglobin (HB) level, hematocrit (HCT) level, complication rate, and in-hospital satisfaction.
RESULTS:
All patients successfully completed the surgery as scheduled, and all were followed up after the operation. The follow-up period ranged from 5 to 17 months with an average of (11.2±6.1) months. There were 4 cases of venous thrombosis in the HRATKA group and 3 cases in the CRATKA group;each group had 2 cases of wound exudation. No mechanical-related complications, pulmonary embolism, or other severe complications occurred. Comparison of the incision length and hospital stay between the HRATKA group and the CRATKA group showed no statistically significant difference (P>0.05). The operation time in the HRATKA group was (96.80±7.10) minutes, which was longer than that in the CRATKA group (90.10±8.80) minutes, and the difference was statistically significant (P<0.05). In the HRATKA group, the HKA angle was (178.93±1.11) degree, the FFC angle was (89.00±0.91)°, and the LFC angle was (7.31±2.17) degree;the corresponding values in the CRATKA group were (178.05±1.34)°, (87.88±1.74)°, and (10.60±2.84) degree respectively. The differences in these three indicators between the two groups were all statistically significant (P<0.05). However, there were no statistically significant differences in the FTC angle or LTC angle between the two groups (P>0.05). There was also no statistically significant difference in the total perioperative blood loss between the two groups (P>0.05). At 3 days after surgery, the VAS score for movement in the HRATKA group (5.95±1.45) points was higher than that in the CRATKA group (4.50±0.97) points, with a statistically significant difference (P<0.05);at 90 days after surgery, there was no statistically significant difference in the movement VAS score between the two groups (P>0.05). Additionally, no statistically significant differences were observed between the two groups in the KSS, ROM at 3 and 90 days after surgery, or satisfaction degree during hospitalization (all P>0.05).
CONCLUSION
The domestic HURWA robot demonstrates excellent performance in osteotomy efficiency and lower limb alignment recovery. The Smith & Nephew Cori robot has a significant advantage in soft tissue assessment and joint stability optimization. Both robotic systems offer high-quality surgical treatments that significantly improve short-term knee function.
Humans
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Male
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Female
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Arthroplasty, Replacement, Knee/instrumentation*
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Aged
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Middle Aged
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Retrospective Studies
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Robotic Surgical Procedures/methods*
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Osteoarthritis, Knee/surgery*
4.Pharmacological actions of the bioactive compounds of Epimedium on the male reproductive system: current status and future perspective.
Song-Po LIU ; Yun-Fei LI ; Dan ZHANG ; Chun-Yang LI ; Xiao-Fang DAI ; Dong-Feng LAN ; Ji CAI ; He ZHOU ; Tao SONG ; Yan-Yu ZHAO ; Zhi-Xu HE ; Jun TAN ; Ji-Dong ZHANG
Asian Journal of Andrology 2025;27(1):20-29
Compounds isolated from Epimedium include the total flavonoids of Epimedium , icariin, and its metabolites (icaritin, icariside I, and icariside II), which have similar molecular structures. Modern pharmacological research and clinical practice have proved that Epimedium and its active components have a wide range of pharmacological effects, especially in improving sexual function, hormone regulation, anti-osteoporosis, immune function regulation, anti-oxidation, and anti-tumor activity. To date, we still need a comprehensive source of knowledge about the pharmacological effects of Epimedium and its bioactive compounds on the male reproductive system. However, their actions in other tissues have been reviewed in recent years. This review critically focuses on the Epimedium , its bioactive compounds, and the biochemical and molecular mechanisms that modulate vital pathways associated with the male reproductive system. Such intrinsic knowledge will significantly further studies on the Epimedium and its bioactive compounds that protect the male reproductive system and provide some guidances for clinical treatment of related male reproductive disorders.
Male
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Epimedium/chemistry*
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Humans
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Genitalia, Male/drug effects*
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Flavonoids/therapeutic use*
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Animals
5.Retrospective Analysis of Venetoclax Combined with Azacitidine Compared with "3+7" or Similar Regimens for Newly Diagnosed Patients with Acute Myeloid Leukemia.
Lu-Lu WANG ; Juan ZHANG ; Yue ZHANG ; Yong ZHANG ; Xiao-Min DONG ; Dan-Yang ZHANG ; Ting-Ting CHEN ; Yun-Hui ZHOU ; Teng WANG ; Hui-Ling LAN ; He-Bing ZHOU
Journal of Experimental Hematology 2025;33(3):672-681
OBJECTIVE:
To retrospectively analyze the clinical data of newly diagnosed acute myeloid leukemia (AML) patients treated with venetoclax combined with azacitidine (Ven/Aza) or standard "3+7" regimen and similar regimens, collect real-world study data, compare the treatment response and adverse events between the two regimens, as well as perform survival analysis.
METHODS:
To retrospectively analyze the efficacy, survival, and adverse reactions of newly diagnosed AML patients treated with Ven/Aza (24 cases) and "3+7" regimens (117 cases ) in our hospital from September 2009 to March 2023, as well as factors influencing outcomes. A propensity score matching (PSM) was performed on age and Eastern Cooperative Oncology Group performance status (ECOG PS) to obtain a 1:1 matched cohort of 20 pairs, and the efficacy and survival before and after the matching were compared.
RESULTS:
The median age of patients in the Ven/Aza group was 69 years, while that in the "3+7" group was 56 years (P <0.001). Objective remission rate (ORR) was 62.5% in Ven/Aza group and 74.8% in "3+7" group (P >0.05). The median overall survival (OS) in the Ven/Aza group was 522 days, while that in the "3+7" group was 1 002 days (P >0.05). After controlling the two variables of age and ECOG PS, a PSM cohort of 20 pairs was obtained, in which the ORR was 65% in Ven/Aza group and 60% in "3+7" group (P >0.05). The median OS was 522 days and 629 days, and median progression-free survival (PFS) was 531 days and 198 days between the two groups, respectively. There were no statistically significant differences in OS and PFS between the two groups (both P >0.05). Additionally, the incidence of adverse events in the Ven/Aza group was significantly reduced.
CONCLUSION
The overall cohort shows that the "3+7" regimen has advantages in efficacy and survival, but Ven/Aza regimen is relatively safer. After performing PSM on age and ECOG PS, the Ven/Aza group showed improved efficacy, and a longer median PFS compared to "3+7" group.
Humans
;
Leukemia, Myeloid, Acute/drug therapy*
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Retrospective Studies
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Sulfonamides/administration & dosage*
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Azacitidine/administration & dosage*
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Bridged Bicyclo Compounds, Heterocyclic/administration & dosage*
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Aged
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Middle Aged
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Male
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Female
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Antineoplastic Combined Chemotherapy Protocols/therapeutic use*
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Treatment Outcome
6.Generalized Functional Linear Models: Efficient Modeling for High-dimensional Correlated Mixture Exposures.
Bing Song ZHANG ; Hai Bin YU ; Xin PENG ; Hai Yi YAN ; Si Ran LI ; Shutong LUO ; Hui Zi WEIREN ; Zhu Jiang ZHOU ; Ya Lin KUANG ; Yi Huan ZHENG ; Chu Lan OU ; Lin Hua LIU ; Yuehua HU ; Jin Dong NI
Biomedical and Environmental Sciences 2025;38(8):961-976
OBJECTIVE:
Humans are exposed to complex mixtures of environmental chemicals and other factors that can affect their health. Analysis of these mixture exposures presents several key challenges for environmental epidemiology and risk assessment, including high dimensionality, correlated exposure, and subtle individual effects.
METHODS:
We proposed a novel statistical approach, the generalized functional linear model (GFLM), to analyze the health effects of exposure mixtures. GFLM treats the effect of mixture exposures as a smooth function by reordering exposures based on specific mechanisms and capturing internal correlations to provide a meaningful estimation and interpretation. The robustness and efficiency was evaluated under various scenarios through extensive simulation studies.
RESULTS:
We applied the GFLM to two datasets from the National Health and Nutrition Examination Survey (NHANES). In the first application, we examined the effects of 37 nutrients on BMI (2011-2016 cycles). The GFLM identified a significant mixture effect, with fiber and fat emerging as the nutrients with the greatest negative and positive effects on BMI, respectively. For the second application, we investigated the association between four pre- and perfluoroalkyl substances (PFAS) and gout risk (2007-2018 cycles). Unlike traditional methods, the GFLM indicated no significant association, demonstrating its robustness to multicollinearity.
CONCLUSION
GFLM framework is a powerful tool for mixture exposure analysis, offering improved handling of correlated exposures and interpretable results. It demonstrates robust performance across various scenarios and real-world applications, advancing our understanding of complex environmental exposures and their health impacts on environmental epidemiology and toxicology.
Humans
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Environmental Exposure/analysis*
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Linear Models
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Nutrition Surveys
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Environmental Pollutants
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Body Mass Index
7.Two new isocoumarins from cave-derived Metarhizium anisopliae NHC-M3-2
Rong-xiang WU ; Jie-lan GUO ; Hua HUANG ; Jing-jing LIAO ; Yi HAO ; Fan-dong KONG ; Li-man ZHOU ; Chao-jun ZHANG
Acta Pharmaceutica Sinica 2024;59(9):2588-2593
Extracting extracts of secondary metabolites from the karst cave fungus
8.Research progress in the diagnosis and control of animal Lyme disease
Jing-Zhe YU ; Jian-Qiao QIU ; Lan ZHOU ; Ren-Dong FANG ; Xue-Lei CHEN
Chinese Journal of Zoonoses 2024;40(1):62-69
Lyme disease is a natural zoonotic infectious disease transmitted by ticks infected by different genotypes of Borre-lia burgdorferi sensu lato,which was discovered in the 1970s.This pathogen is prevalent primarily in temperate and subtropi-cal areas.Dogs,cats,horses,cattle,deer,and other animals are susceptible,and humans are also susceptible hosts.The main symptoms of Lyme disease in humans are erythema migrans,arthritis,and other neurological symptoms,and the common symptoms in infected animals include joint diseases,coat shedding,fever,laminitis,and lameness.Lyme disease is wide-spread,but diagnosis is difficult,and this disease is easily misdiagnosed and missed.Awareness of Lyme disease must be in-creased to avoid its toll on livestock and the pet industry.Therefore,this article reviews research progress in diagnosis and con-trol technology for animal Lyme disease and Borrelia burgdorferi,to provide a reference for accurate,rapid diagnosis and con-trol of Lyme disease.
9.Chinese expert consensus on blood support mode and blood transfusion strategies for emergency treatment of severe trauma patients (version 2024)
Yao LU ; Yang LI ; Leiying ZHANG ; Hao TANG ; Huidan JING ; Yaoli WANG ; Xiangzhi JIA ; Li BA ; Maohong BIAN ; Dan CAI ; Hui CAI ; Xiaohong CAI ; Zhanshan ZHA ; Bingyu CHEN ; Daqing CHEN ; Feng CHEN ; Guoan CHEN ; Haiming CHEN ; Jing CHEN ; Min CHEN ; Qing CHEN ; Shu CHEN ; Xi CHEN ; Jinfeng CHENG ; Xiaoling CHU ; Hongwang CUI ; Xin CUI ; Zhen DA ; Ying DAI ; Surong DENG ; Weiqun DONG ; Weimin FAN ; Ke FENG ; Danhui FU ; Yongshui FU ; Qi FU ; Xuemei FU ; Jia GAN ; Xinyu GAN ; Wei GAO ; Huaizheng GONG ; Rong GUI ; Geng GUO ; Ning HAN ; Yiwen HAO ; Wubing HE ; Qiang HONG ; Ruiqin HOU ; Wei HOU ; Jie HU ; Peiyang HU ; Xi HU ; Xiaoyu HU ; Guangbin HUANG ; Jie HUANG ; Xiangyan HUANG ; Yuanshuai HUANG ; Shouyong HUN ; Xuebing JIANG ; Ping JIN ; Dong LAI ; Aiping LE ; Hongmei LI ; Bijuan LI ; Cuiying LI ; Daihong LI ; Haihong LI ; He LI ; Hui LI ; Jianping LI ; Ning LI ; Xiying LI ; Xiangmin LI ; Xiaofei LI ; Xiaojuan LI ; Zhiqiang LI ; Zhongjun LI ; Zunyan LI ; Huaqin LIANG ; Xiaohua LIANG ; Dongfa LIAO ; Qun LIAO ; Yan LIAO ; Jiajin LIN ; Chunxia LIU ; Fenghua LIU ; Peixian LIU ; Tiemei LIU ; Xiaoxin LIU ; Zhiwei LIU ; Zhongdi LIU ; Hua LU ; Jianfeng LUAN ; Jianjun LUO ; Qun LUO ; Dingfeng LYU ; Qi LYU ; Xianping LYU ; Aijun MA ; Liqiang MA ; Shuxuan MA ; Xainjun MA ; Xiaogang MA ; Xiaoli MA ; Guoqing MAO ; Shijie MU ; Shaolin NIE ; Shujuan OUYANG ; Xilin OUYANG ; Chunqiu PAN ; Jian PAN ; Xiaohua PAN ; Lei PENG ; Tao PENG ; Baohua QIAN ; Shu QIAO ; Li QIN ; Ying REN ; Zhaoqi REN ; Ruiming RONG ; Changshan SU ; Mingwei SUN ; Wenwu SUN ; Zhenwei SUN ; Haiping TANG ; Xiaofeng TANG ; Changjiu TANG ; Cuihua TAO ; Zhibin TIAN ; Juan WANG ; Baoyan WANG ; Chunyan WANG ; Gefei WANG ; Haiyan WANG ; Hongjie WANG ; Peng WANG ; Pengli WANG ; Qiushi WANG ; Xiaoning WANG ; Xinhua WANG ; Xuefeng WANG ; Yong WANG ; Yongjun WANG ; Yuanjie WANG ; Zhihua WANG ; Shaojun WEI ; Yaming WEI ; Jianbo WEN ; Jun WEN ; Jiang WU ; Jufeng WU ; Aijun XIA ; Fei XIA ; Rong XIA ; Jue XIE ; Yanchao XING ; Yan XIONG ; Feng XU ; Yongzhu XU ; Yongan XU ; Yonghe YAN ; Beizhan YAN ; Jiang YANG ; Jiangcun YANG ; Jun YANG ; Xinwen YANG ; Yongyi YANG ; Chunyan YAO ; Mingliang YE ; Changlin YIN ; Ming YIN ; Wen YIN ; Lianling YU ; Shuhong YU ; Zebo YU ; Yigang YU ; Anyong YU ; Hong YUAN ; Yi YUAN ; Chan ZHANG ; Jinjun ZHANG ; Jun ZHANG ; Kai ZHANG ; Leibing ZHANG ; Quan ZHANG ; Rongjiang ZHANG ; Sanming ZHANG ; Shengji ZHANG ; Shuo ZHANG ; Wei ZHANG ; Weidong ZHANG ; Xi ZHANG ; Xingwen ZHANG ; Guixi ZHANG ; Xiaojun ZHANG ; Guoqing ZHAO ; Jianpeng ZHAO ; Shuming ZHAO ; Beibei ZHENG ; Shangen ZHENG ; Huayou ZHOU ; Jicheng ZHOU ; Lihong ZHOU ; Mou ZHOU ; Xiaoyu ZHOU ; Xuelian ZHOU ; Yuan ZHOU ; Zheng ZHOU ; Zuhuang ZHOU ; Haiyan ZHU ; Peiyuan ZHU ; Changju ZHU ; Lili ZHU ; Zhengguo WANG ; Jianxin JIANG ; Deqing WANG ; Jiongcai LAN ; Quanli WANG ; Yang YU ; Lianyang ZHANG ; Aiqing WEN
Chinese Journal of Trauma 2024;40(10):865-881
Patients with severe trauma require an extremely timely treatment and transfusion plays an irreplaceable role in the emergency treatment of such patients. An increasing number of evidence-based medicinal evidences and clinical practices suggest that patients with severe traumatic bleeding benefit from early transfusion of low-titer group O whole blood or hemostatic resuscitation with red blood cells, plasma and platelet of a balanced ratio. However, the current domestic mode of blood supply cannot fully meet the requirements of timely and effective blood transfusion for emergency treatment of patients with severe trauma in clinical practice. In order to solve the key problems in blood supply and blood transfusion strategies for emergency treatment of severe trauma, Branch of Clinical Transfusion Medicine of Chinese Medical Association, Group for Trauma Emergency Care and Multiple Injuries of Trauma Branch of Chinese Medical Association, Young Scholar Group of Disaster Medicine Branch of Chinese Medical Association organized domestic experts of blood transfusion medicine and trauma treatment to jointly formulate Chinese expert consensus on blood support mode and blood transfusion strategies for emergency treatment of severe trauma patients ( version 2024). Based on the evidence-based medical evidence and Delphi method of expert consultation and voting, 10 recommendations were put forward from two aspects of blood support mode and transfusion strategies, aiming to provide a reference for transfusion resuscitation in the emergency treatment of severe trauma and further improve the success rate of treatment of patients with severe trauma.
10.A community-based serological cohort study on incidence of seasonal influenza virus infection in Macheng city from winter 2019 to spring 2020
Jinsong FAN ; Jianbo ZHAN ; Yue CHEN ; Shaobo DONG ; Jian LU ; Junfeng GUO ; Xiaojing LIN ; Yu LAN ; Kun QIN ; Jianfang ZHOU ; Bing HU ; Cuiling XU
Chinese Journal of Experimental and Clinical Virology 2024;38(3):311-318
Objective:To determine incidence of seasonal influenza virus infection in the community and to analyze the factors influencing seasonal influenza virus infection.Methods:This study recruited residents aged 6-59 years to build a cohort in 15 villages/streets in Macheng city in November 2019. Meanwhile, a cross-sectional baseline survey was conducted immediately to collect sera, information on demographics and child protection knowledge, behaviors, as well as attitudes using a questionnaire from the participants enrolled in the cohort (i.e., before the influenza epidemic season). In July 2020, a cross-sectional follow-up survey was conducted to collect sera once again (i.e., after the influenza season). Paired sera from the two cross-sectional surveys were tested for influenza virus-specific antibodies by hemagglutination inhibition (HI) test or micro-neutralization (MN) test using a circulating representative strain of each subtype/lineage of influenza virus as the test antigen. The infections with influenza virus subtype/lineage was confirmed if there was a four-fold or more increase in titers of antibodies against circulating representative strain of the subtype/lineage of influenza virus. Factors influencing infection with influenza A (H3N2) and B/Victoria viruses were analyzed using univariable and multivariable logistic regression.Results:In November 2019, 800 study participants were enrolled in the cohort, including 340 children aged 6-17 years and 460 adults aged 18-59 years; 605 study participants (including 224 children and 381 adults) were followed up in July 2020 and their paired sera were obtained before and after the influenza season. 25.3% (153/605) of the participants were confirmed to be infected with at least one subtype/lineage of seasonal influenza virus by HI and MN tests. The overall incidence of influenza viruses of all subtypes/lineages in children was 44.2% (95% CI: 37.6%-50.8%) which was significantly higher than the incidence of 14.1% in adults (95% CI: 10.7%-17.7%). Children had the highest incidence of influenza A (H3N2) virus infection, followed by B/Victoria. MN or HI antibody titers in A (H3N2)[ OR=0.88 (95% CI: 0.84-0.93)] and B/Victoria[ OR=0.97 (95% CI: 0.95-0.99)] before the influenza season were significantly associated with whether children were infected with that subtype/lineage of influenza virus. Conclusions:The residents aged 6-59 years in Macheng city had a substantial incidence of seasonal influenza virus infection during the influenza season from winter 2019 to spring 2020. Notably, almost half of children aged 6-17 years have been infected with seasonal influenza virus. Higher titers of HI/MN antibodies against seasonal influenza virus before the influenza season would be likely to reduce the risk of infection with influenza A (H3N2) and B/Victoria.

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