1.Screening key genes of PANoptosis in hepatic ischemia-reperfusion injury based on bioinformatics
Lirong ZHU ; Qian GUO ; Jie YANG ; Qiuwen ZHANG ; Guining HE ; Yanqing YU ; Ning WEN ; Jianhui DONG ; Haibin LI ; Xuyong SUN
Organ Transplantation 2025;16(1):106-113
Objective To explore the relationship between PANoptosis and hepatic ischemia-reperfusion injury (HIRI), and to screen the key genes of PANoptosis in HIRI. Methods PANoptosis-related differentially expressed genes (PDG) were obtained through the Gene Expression Omnibus database and GeneCards database. Gene ontology (GO), Kyoto Encyclopedia of Genes and Genomes (KEGG), and Gene Set Enrichment Analysis (GSEA) were used to explore the biological pathways related to PDG. A protein-protein interaction network was constructed. Key genes were selected, and their diagnostic value was assessed and validated in the HIRI mice. Immune cell infiltration analysis was performed based on the cell-type identification by estimating relative subsets of RNA transcripts. Results A total of 16 PDG were identified. GO analysis showed that PDG were closely related to cellular metabolism. KEGG analysis indicated that PDG were mainly enriched in cellular death pathways such as apoptosis and immune-related signaling pathways such as the tumor necrosis factor signaling pathway. GSEA results showed that key genes were mainly enriched in immune-related signaling pathways such as the mitogen-activated protein kinase (MAPK) signaling pathway. Two key genes, DFFB and TNFSF10, were identified with high accuracy in diagnosing HIRI, with areas under the curve of 0.964 and 1.000, respectively. Immune infiltration analysis showed that the control group had more infiltration of resting natural killer cells, M2 macrophages, etc., while the HIRI group had more infiltration of M0 macrophages, neutrophils, and naive B cells. Real-time quantitative polymerase chain reaction results showed that compared with the Sham group, the relative expression of DFFB messenger RNA in liver tissue of HIRI group mice increased, and the relative expression of TNFSF10 messenger RNA decreased. Cibersort analysis showed that the infiltration abundance of naive B cells was positively correlated with DFFB expression (r=0.70, P=0.035), and the infiltration abundance of M2 macrophages was positively correlated with TNFSF10 expression (r=0.68, P=0.045). Conclusions PANoptosis-related genes DFFB and TNFSF10 may be potential biomarkers and therapeutic targets for HIRI.
2.Surveillance of bacterial resistance in tertiary hospitals across China:results of CHINET Antimicrobial Resistance Surveillance Program in 2022
Yan GUO ; Fupin HU ; Demei ZHU ; Fu WANG ; Xiaofei JIANG ; Yingchun XU ; Xiaojiang ZHANG ; Fengbo ZHANG ; Ping JI ; Yi XIE ; Yuling XIAO ; Chuanqing WANG ; Pan FU ; Yuanhong XU ; Ying HUANG ; Ziyong SUN ; Zhongju CHEN ; Jingyong SUN ; Qing CHEN ; Yunzhuo CHU ; Sufei TIAN ; Zhidong HU ; Jin LI ; Yunsong YU ; Jie LIN ; Bin SHAN ; Yunmin XU ; Sufang GUO ; Yanyan WANG ; Lianhua WEI ; Keke LI ; Hong ZHANG ; Fen PAN ; Yunjian HU ; Xiaoman AI ; Chao ZHUO ; Danhong SU ; Dawen GUO ; Jinying ZHAO ; Hua YU ; Xiangning HUANG ; Wen'en LIU ; Yanming LI ; Yan JIN ; Chunhong SHAO ; Xuesong XU ; Wei LI ; Shanmei WANG ; Yafei CHU ; Lixia ZHANG ; Juan MA ; Shuping ZHOU ; Yan ZHOU ; Lei ZHU ; Jinhua MENG ; Fang DONG ; Zhiyong LÜ ; Fangfang HU ; Han SHEN ; Wanqing ZHOU ; Wei JIA ; Gang LI ; Jinsong WU ; Yuemei LU ; Jihong LI ; Qian SUN ; Jinju DUAN ; Jianbang KANG ; Xiaobo MA ; Yanqing ZHENG ; Ruyi GUO ; Yan ZHU ; Yunsheng CHEN ; Qing MENG ; Shifu WANG ; Xuefei HU ; Wenhui HUANG ; Juan LI ; Quangui SHI ; Juan YANG ; Abulimiti REZIWAGULI ; Lili HUANG ; Xuejun SHAO ; Xiaoyan REN ; Dong LI ; Qun ZHANG ; Xue CHEN ; Rihai LI ; Jieli XU ; Kaijie GAO ; Lu XU ; Lin LIN ; Zhuo ZHANG ; Jianlong LIU ; Min FU ; Yinghui GUO ; Wenchao ZHANG ; Zengguo WANG ; Kai JIA ; Yun XIA ; Shan SUN ; Huimin YANG ; Yan MIAO ; Mingming ZHOU ; Shihai ZHANG ; Hongjuan LIU ; Nan CHEN ; Chan LI ; Jilu SHEN ; Wanqi MEN ; Peng WANG ; Xiaowei ZHANG ; Yanyan LIU ; Yong AN
Chinese Journal of Infection and Chemotherapy 2024;24(3):277-286
Objective To monitor the susceptibility of clinical isolates to antimicrobial agents in tertiary hospitals in major regions of China in 2022.Methods Clinical isolates from 58 hospitals in China were tested for antimicrobial susceptibility using a unified protocol based on disc diffusion method or automated testing systems.Results were interpreted using the 2022 Clinical &Laboratory Standards Institute(CLSI)breakpoints.Results A total of 318 013 clinical isolates were collected from January 1,2022 to December 31,2022,of which 29.5%were gram-positive and 70.5%were gram-negative.The prevalence of methicillin-resistant strains in Staphylococcus aureus,Staphylococcus epidermidis and other coagulase-negative Staphylococcus species(excluding Staphylococcus pseudintermedius and Staphylococcus schleiferi)was 28.3%,76.7%and 77.9%,respectively.Overall,94.0%of MRSA strains were susceptible to trimethoprim-sulfamethoxazole and 90.8%of MRSE strains were susceptible to rifampicin.No vancomycin-resistant strains were found.Enterococcus faecalis showed significantly lower resistance rates to most antimicrobial agents tested than Enterococcus faecium.A few vancomycin-resistant strains were identified in both E.faecalis and E.faecium.The prevalence of penicillin-susceptible Streptococcus pneumoniae was 94.2%in the isolates from children and 95.7%in the isolates from adults.The resistance rate to carbapenems was lower than 13.1%in most Enterobacterales species except for Klebsiella,21.7%-23.1%of which were resistant to carbapenems.Most Enterobacterales isolates were highly susceptible to tigecycline,colistin and polymyxin B,with resistance rates ranging from 0.1%to 13.3%.The prevalence of meropenem-resistant strains decreased from 23.5%in 2019 to 18.0%in 2022 in Pseudomonas aeruginosa,and decreased from 79.0%in 2019 to 72.5%in 2022 in Acinetobacter baumannii.Conclusions The resistance of clinical isolates to the commonly used antimicrobial agents is still increasing in tertiary hospitals.However,the prevalence of important carbapenem-resistant organisms such as carbapenem-resistant K.pneumoniae,P.aeruginosa,and A.baumannii showed a downward trend in recent years.This finding suggests that the strategy of combining antimicrobial resistance surveillance with multidisciplinary concerted action works well in curbing the spread of resistant bacteria.
3.Treatment status of tyrosine kinase inhibitor for newly-diagnosed chronic myeloid leukemia: a domestic multi-centre retrospective real-world study
Xiaoshuai ZHANG ; Bingcheng LIU ; Xin DU ; Yanli ZHANG ; Na XU ; Xiaoli LIU ; Weiming LI ; Hai LIN ; Rong LIANG ; Chunyan CHEN ; Jian HUANG ; Yunfan YANG ; Huanling ZHU ; Ling PAN ; Xiaodong WANG ; Guohui LI ; Zhuogang LIU ; Yanqing ZHANG ; Zhenfang LIU ; Jianda HU ; Chunshui LIU ; Fei LI ; Wei YANG ; Li MENG ; Yanqiu HAN ; Li'e LIN ; Zhenyu ZHAO ; Chuanqing TU ; Caifeng ZHENG ; Yanliang BAI ; Zeping ZHOU ; Suning CHEN ; Huiying QIU ; Lijie YANG ; Xiuli SUN ; Hui SUN ; Li ZHOU ; Zelin LIU ; Danyu WANG ; Jianxin GUO ; Liping PANG ; Qingshu ZENG ; Xiaohui SUO ; Weihua ZHANG ; Yuanjun ZHENG ; Qian JIANG
Chinese Journal of Hematology 2024;45(3):215-224
Objective:To retrospectively analyze the treatment status of tyrosine kinase inhibitors (TKI) in newly diagnosed patients with chronic myeloid leukemia (CML) in China.Methods:Data of chronic phase (CP) and accelerated phase (AP) CML patients diagnosed from January 2006 to December 2022 from 77 centers, ≥18 years old, and receiving initial imatinib, nilotinib, dasatinib or flumatinib-therapy within 6 months after diagnosis in China with complete data were retrospectively interrogated. The choice of initial TKI, current TKI medications, treatment switch and reasons, treatment responses and outcomes as well as the variables associated with them were analyzed.Results:6 893 patients in CP ( n=6 453, 93.6%) or AP ( n=440, 6.4%) receiving initial imatinib ( n=4 906, 71.2%), nilotinib ( n=1 157, 16.8%), dasatinib ( n=298, 4.3%) or flumatinib ( n=532, 7.2%) -therapy. With the median follow-up of 43 ( IQR 22-75) months, 1 581 (22.9%) patients switched TKI due to resistance ( n=1 055, 15.3%), intolerance ( n=248, 3.6%), pursuit of better efficacy ( n=168, 2.4%), economic or other reasons ( n=110, 1.6%). The frequency of switching TKI in AP patients was significantly-higher than that in CP patients (44.1% vs 21.5%, P<0.001), and more AP patients switched TKI due to resistance than CP patients (75.3% vs 66.1%, P=0.011). Multi-variable analyses showed that male, lower HGB concentration and ELTS intermediate/high-risk cohort were associated with lower cytogenetic and molecular responses rate and poor outcomes in CP patients; higher WBC count and initial the second-generation TKI treatment, the higher response rates; Ph + ACA at diagnosis, poor PFS. However, Sokal intermediate/high-risk cohort was only significantly-associated with lower CCyR and MMR rates and the poor PFS. Lower HGB concentration and larger spleen size were significantly-associated with the lower cytogenetic and molecular response rates in AP patients; initial the second-generation TKI treatment, the higher treatment response rates; lower PLT count, higher blasts and Ph + ACA, poorer TFS; Ph + ACA, poorer OS. Conclusion:At present, the vast majority of newly-diagnosed CML-CP or AP patients could benefit from TKI treatment in the long term with the good treatment responses and survival outcomes.
4.Terpene extract from the stem of Celastrus orbiculatus inhibits actin cytoskeleton remodelling in gastric cancer cells by regulating the protein interaction between PTBP1 and ACTN4
Chu ZEWEN ; Zhu MIAO ; Luo YUANYUAN ; Hu YAQI ; Feng XINYI ; Shen JIACHENG ; Wang HAIBO ; Sunagawa MASATAKA ; Liu YANQING
Journal of Pharmaceutical Analysis 2024;14(8):1158-1175
Adjuvant chemoradiotherapy,molecular targeted therapy,and immunotherapy are frequently employed to extend the survival of patients with advanced gastric cancer(GC).However,most of these treatments have toxic side effects,drug resistance,and limited improvements in survival and quality of life.Therefore,it is crucial to discover and develop new medications targeting GC that are highly effective and have minimal toxicity.In previous studies,the total terpene extract from the stem of Celastrus orbiculatus demonstrated anti-GC activity;however,the specific mechanism was unclear.Our research utilising co-immunoprecipitation-mass spectrometry(Co-IP-MS),polypyrimidine tract binding protein 1(ptbp1)clustered regularly interspaced short palindromic repeat-associated protein 9(Cas9)-knockout(KO)mouse model,tissue microarray,and functional experiments suggests that alpha actinin-4(ACTN4)could be a significant biomarker of GC.PTBP1 influences actin cytoskeleton restructuring in GC cells by interacting with ACTN4.Celastrus orbiculatus stem extract(COE)may directly target ACTN4 and affect the interaction between PTBP1 and ACTN4,thereby exerting anti-GC effects.
5.Mechanism of Reversal of Precancerous Lesions of Gastric Cancer by Celastrus orbiculatus Extract via Regulating Lgr5/Wnt/β-catenin Signaling Pathway
Xiaoze ZHANG ; Fangyuan ZHU ; Junsong WEN ; Yanqing LIU ; Yaodong ZHU
Chinese Journal of Experimental Traditional Medical Formulae 2024;30(12):70-77
ObjectiveThis study aims to investigate the mechanism in which Celastrus orbiculatus extract (COE) affects the proliferation and differentiation of gastric organoids and the expression of Lgr5 and thus reverses the precancerous lesions of gastric cancer (PLGC) by regulating the leucine-rich repeat containing G protein-coupled receptor 5 (Lgr5)/Wingless (Wnt)/β-catenin signaling pathway based on a gastric organoid injury model. MethodGastric organoids were established based on stem cells of the mouse gastric gland. Gastric organoid injury models were constructed by treating gastric organoids with N-methyl-N'-nitro-N-nitrosoguanidine (MNNG, 0.02 mg·L-1). Gastric organoid injury models were randomly divided into normal group, model group (0.02 mg·L-1 MNNG), low, medium, and high dose (5, 10, 20 mg·L-1) groups of COE, and Wnt inhibitor Dickkopf-related protein 1 (DKK1) (0.5 mg·L-1) group, and they were treated with respective agents for 24 h. The number and volume of gastric organoids under different drug concentrations were observed under a microscope. The viability of the gastric organoid injury models was detected by Methyl thiazolyl tetrazolium (MTT) assay. The morphology and pathology of gastric organoids were observed using Hematoxylin and Eosin (HE) staining. The expression levels of Lgr5, Mucin2 (MUC2), Mucin5AC (MUC5AC), Mucin6 (MUC6), Wnt, and β-catenin in gastric organoids under different drug concentrations were detected by Western blot (WB). ResultCompared with the normal group, the number, volume, and activity of gastric organoids in the model group were decreased (P<0.01), while the expressions of Lgr5, MUC2, Wnt, and β-catenin were significantly increased (P<0.01). The expressions of MUC5AC and MUC6 were significantly decreased (P<0.01). Compared with the model group, the number and volume of gastric organoids in the low, medium, and high dose groups of COE were all improved (P<0.01), and the vitality of gastric organoids was significantly enhanced (P<0.01). The effect was the most significant at a COE concentration of 20 mg·L-1 (P<0.01). The expressions of Lgr5 and MUC2 in the medium and high dose groups of COE were significantly reduced (P<0.01), while the expression of MUC5AC and MUC6 were significantly increased in the low, medium, and high dose groups of COE (P<0.05, P<0.01). Compared with the model group, Wnt inhibitors could promote the expression of MUC5AC and MUC6 in gastric organoids (P<0.05, P<0.01) and reduce the expression of MUC2, Wnt, and β-catenin. In addition, the combined use of COE at high concentrations and Wnt inhibitors could further promote this trend (P<0.01). ConclusionCOE inhibits the Wnt/β-catenin pathway by inhibiting the expression of Lgr5, MUC2, Wnt, and β-catenin and promoting the expression of MUC5AC and MUC6, thus promoting the proliferation and differentiation of gastric organoids and reversing the PLGC process.
6.Correlation between high cholinergic pathway signal and cognitive function in patients with Parkinson disease accompanied with sleep disorder
Xinrong XU ; Hao WANG ; Yuqing FANG ; Fei MAO ; Zhangning ZHAO ; Yanhong REN ; Xiaoran ZHU ; Tianhao LIU ; Yanqing ZHANG ; Xiuhua LI
Chinese Journal of Behavioral Medicine and Brain Science 2024;33(3):206-211
Objective:To explore the correlation between high cholinergic pathway signaling and cognitive function in patients with Parkinson disease(PD) accompanied with sleep disorder.Methods:PD patients admitted from 2017 to 2022 were divided into PD with sleep disorder group (PD-SD group) ( n=56) and PD without sleep disorder group (PD-NSD group) ( n=41) according to the Parkinson's disease sleep scale (PDSS) score. All participants underwent magnetic resonance imaging examination.All patients were evaluated by the PDSS, Hoehn-Yahr (H-Y), Montreal cognitive assessment scale (MoCA), and cholinergic pathways hyper intensities scale (CHIPS). The difference of cognitive function between the two groups and the correlation between CHIPS and cognitive function were analyzed.Independent sample t-test, Spearman correlation analysis, and binary Logistic regression analysis were performed on the data by SPSS 26.0 statistical software. Results:(1)The MoCA score of the PD-SD group (22.00 (5.00)) was lower than that of the PD-NSD group (26.00 (5.00)) ( Z=-3.830, P<0.05). The total and all aspects scores of CHIPS in PD-SD group were higher than those in PD-NSD group(the total score of the low external capsule: 12.00(8.00), 0(8.00), the total score of the high external capsule: 12.00(2.00), 6.00(9.00), the total score of the radial crown: 8.00(0), 4.00(4.00), the total score of the centrum semiovale: 3.00(4.00), 0(2.00), the total score of the right side: 16.00(9.00), 5.00(10.00), the total score of the left side: 17.00(6.00), 7.00(9.00), the total score of CHIPS: 32.00(14.00), 14.00(20.00))( Z=-5.081, -5.873, -4.933, -3.211, -5.562, -6.232, -5.995, all P<0.05). (2)The correlation analysis between the score of CHIPS and cognitive function in the PD-SD group showed that, the total score of the low external capsule ( r=-0.286), the total score of the centrum semiovale ( r=-0.307), the total score of the right side ( r=-0.376), the total score of the left side ( r=-0.284) and the total score of CHIPS ( r=-0.349) were negatively correlated with MoCA(all P<0.05). (3)Binary Logistic regression analysis showed that white matter lesions in centrum semiovale, low inner capsule, right and left leukodystrophy were not influence factors for cognitive impairment (all P>0.05). Conclusion:PD patients with sleep disorders have lower cognitive function scores, higher CHIPS scores, and significant changes in white matter lesions compared to those without sleep disorders. In PD patients with sleep disorders, the higher the CHIPS score, the lower the cognitive function score, and the more significant the rate of cognitive impairment occurrence and development.
7.Mechanism of Treatment of Hepatocellular Carcinoma with Traditional Chinese Medicine Based on Epigenetic Regulation: A Review
Xianyu XU ; Yongping ZHU ; Yanqing LIU ; Liwei GU ; Junzhe ZHANG ; Shengnan SHEN ; Jigang WANG
Chinese Journal of Experimental Traditional Medical Formulae 2024;30(23):281-291
Hepatocellular carcinoma (HCC) is the sixth most common cancer in the world. In recent years, the clinical early diagnosis and treatment protocols of HCC have been improved, whereas the prognosis of patients is still not satisfactory, which is due to the fact that the mechanism of HCC development has not been fully elucidated. Therefore, it is of great significance to explore the molecular mechanisms and key regulatory links of hepatocellular carcinoma development to further improve the diagnosis and treatment of HCC in China. Epigenetics has become a research hotspot because of its reversibility and easy regulation. According to relevant studies, HCC involves the accumulation of multiple genetic and epigenetic changes during the initiation, promotion, and progression stages. HCC is categorized as infantile malnutrition with accumulation, hypochondriac pain, tympan ites, and abdominal mass in traditional Chinese medicine (TCM). In the treatment of HCC, TCM with low toxicity, multi-targets, and multi-mechanisms can inhibit tumor growth, alleviate the clinical symptoms, and enhance the quality of life of the patients. Chinese medicines and their active ingredients exert anti-HCC effects through epigenetic regulation of DNA methylation, histone modification, and non-coding RNA. Abnormal gene expression due to epigenetic regulation disorders is involved in all stages of HCC development. There are few studies on epigenetic regulation in TCM treatment of HCC, and there is still much room for development in basic and clinical trials. This paper reviews the mechanism of epigenetic regulation in HCC and summarizes the experimental results of TCM research on the related mechanism, with a view to providing a theoretical basis for future research on the mechanism of HCC development and clinical diagnosis and treatment of hepatocellular carcinoma with TCM.
8.Investigation on the causes of visual disability in Yangpu district of Shanghai from 2019 to 2022
Jianxiu FENG ; Lu CHEN ; Jia WANG ; Xiqian ZHU ; Zuxian SUN ; Mengjia ZHANG ; Hong WANG ; Yanqing FENG ; Minmin JIANG
International Eye Science 2024;24(8):1341-1344
AIM: To analyze the causes of blindness and low vision in patients with visual disability in Yangpu District of Shanghai from 2019 to 2022.METHODS:Cross-sectional study. A total of 1 604 patients who participated in the evaluation of visual disability in Shanghai Yangpu District Kongjiang Hospital, from April 2019 to December 2022 were selected for the study. The grade of visual disability and the main causes of blindness and low vision were determined by trained doctors.RESULTS:A total of 804 patients with visual disabilities were identified, with 87.31% aged 60 and above. The causes of visual disability were high myopic retinopathy(30.47%), age-related macular degeneration(23.26%), glaucoma(17.04%), and diabetic retinopathy(11.07%). Glaucoma(36.96%)is the leading cause of blindness.CONCLUSION: The majority of patients with visual disability are aged 60 years and above. More attention should be paid to the elderly population. Comprehensive prevention, treatment and rehabilitation measures should be applied in different diseases based on classification, so as to early reduce the occurrence of visual disability.
9.Mechanism of Pachymic Acid in Inhibiting Invasion and Metastasis of Renal Carcinoma Cells via Regulating MMP/TIMP Balance by Smads
Yuanyuan LUO ; Xinyi FENG ; Zewen CHU ; Hong ZHU ; Yanqing LIU ; Haibo WANG
Chinese Journal of Experimental Traditional Medical Formulae 2023;29(7):76-83
ObjectiveTo investigate the effect and mechanism of pachymic acid (PA) in Poria on the invasion and metastasis of renal carcinoma cells. MethodThe effect of PA (0, 20, 40, 80, 160 μmol·L-1) on cell viability was detected by cell counting kit-8(CCK-8), and the dose of PA was selected for subsequent experiments. The effect of PA (0, 20, 40, 80 μmol·L-1) on cell proliferation was evaluated by colony formation assay. The effect of PA (0, 20, 40, 80 μmol·L-1) on cell adhesion ability was observed by cell adhesion assay. The effect of PA (0, 20, 40, and 80 μmol·L-1) on cell invasion and metastasis was investigated by Wound healing assay and Transwell invasion assay. The inhibitory effect of PA (0, 20, 40, 80 μmol·L-1) on cell motility was further observed and verified by high-content imaging technology. The effects of PA (0, 20, 40, 80 μmol·L-1) on the expression of matrix metalloproteinase (MMP)/tissue inhibitor of metalloproteinasas (TIMP) related to invasion and metastasis and Smads were detected by Western blot. ResultCCK-8 results showed that compared with the blank group, the PA groups showed decreased cell viability(P<0.01), with the half-maximal inhibitory concentration (IC50) of ACHN cells of 70.42 μmol·L-1 at 24 h. Colony formation assay showed that the number of cell clonal groups in the PA groups was reduced compared with that in the blank group(P<0.01). Cell adhesion assay showed that compared with the blank group, the PA groups displayed reduced cell adhesion(P<0.01). Wound healing assay showed that the wound healing rate of cells in the PA groups was lower than that in the blank group (P<0.05,P<0.01). Transwell invasion assay showed that compared with the blank group, the number of transmembrane cells in PA groups was reduced(P<0.01). High-content imaging showed that the cumulative migration distance of cells in the PA groups was shorter than that in the blank group(P<0.01). The results of Western blot showed that the protein expression of MMP-2 and MMP-9 in the PA groups decreased (P<0.01), and TIMP-1 protein expression increased (P<0.01) compared with those in the blank group. In addition, compared with the blank group, the PA groups showed decreased protein expression of Smad2 and Smad3 (P<0.01). ConclusionPA can inhibit the invasion and metastasis of renal carcinoma cells presumably through regulating the homeostasis of MMP/TIMP by Smad2/3.
10.Epidemiological investigation of a cluster of COVID-19 in badminton venues
XIANG Zelin ; FU Xiaofei ; QI Yunpeng ; ZHU Guoying ; GU Weiling ; HU Jie ; LI Fudong ; ZHOU Wanling ; HOU Zhigang ; LIU Yang ; LIU Yanqing ; GUO Feifei ; LU Xianquan ; GUO Linjie ; CHEN Zhongwen
Journal of Preventive Medicine 2023;35(4):316-319
Objective:
To perform an epidemiological survey of the first case with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection in Pinghu City of Jiaxing City, Zhejiang Province on March 13, 2022, so as to provide insights into the management of coronavirus disease (COVID-19) epidemics.
Methods:
According to the requirements of the Protocol on Prevention and Control of COVID-19 (8th Edition), epidemiological investigations were performed among 39 cases with SARS-CoV-2 infections in Pinghu City from March 13 to 20, 2022. Cases' demographics, clinical symptoms, history of immunization and exposure were collected, and close contacts were identified. Pharyngeal swabs were sampled from infected cases for detection of SARS-CoV-2 nucleic acid and whole-genome sequencing, and the source of infection and transmission route were investigated.
Results:
The index case for this COVID-19 epidemic was an imported case from Shanghai Municipality, who infected 6 persons via aerosol transmission when playing in the badminton venue of Pinghu National Fitness Center on March 9; subsequently, one of these infected cases infected another 18 persons when playing in the badminton venue of Jiadian Village Resident's Fitness Center in Zhapu Township on March 12. Sixteen confirmed cases were reported, and all cases were mild; another 23 asymptomatic cases were diagnosed, with no death reported. This epidemic occurred from March 11 to 20, with 3 generations of spread and a median incubation period of 3 days. The SARS-CoV-2 infected cases had a median age of 33.5 (interquartile range, 12.0) years and included 36 cases with a history of COVID-19 vaccination. There were 16 cases with fever, cough, runny nose and sore throat, and 13 cases with imaging features of pneumonia. The effective reproductive number (Rt) of the COVID-19 epidemic was 7.73 at early stage, and was less than 1 since March 21. Whole-genome sequencing identified Omicron BA.2 variant among 33 cases, which had high homology with the index cases.
Conclusion
This epidemic was a cluster of COVID-19 caused by imported Omicron BA.2 variant infection from Shanghai Municipality, and the COVID-19 transmission was mainly caused by indoor aerosols.


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