Objective To investigate the positive nucleic acid detection of respiratory syncytial virus(RSV)in children with acute respiratory tract infection in Hangzhou.Methods The information of RSV nucleic acid positive cases detected in Hangzhou Children's Hospital from January 2017 to December 2022 was collected and analyzed retrospectively by age,gender,detection time and other factors.Results A total of 22 755 samples were sent for examination,among which 4079 cases of RSV were reported,with a total positive detection rate of 17.93%,showing constant fluctuation of infection over the years.In terms of gender,the positive detection rate of RSV was 10.36%in boys and 7.57%in girls,and the ratio of male to female was 1.36:1,the difference was statistically significant(P<0.05).In terms of age,there were 2378 positive cases in infants<1 year old,accounting for 58.30%of all positive cases,and 94.93%in infants<3 years old.The positive detection rate of RSV in children of different age groups showed a decreasing trend with the increase of age.In terms of seasons,RSV occurred frequently in autumn and winter,and the detection rate in two seasons was 83.82%,while the detection rate in spring and summer was only 16.18%.The positive detection rate of RSV in autumn and winter was significantly higher than that in spring and summer(P<0.05).Conclusion RSV infection fluctuates in children with acute respiratory tract infection in Hangzhou over the years,and the incidence is high in autumn and winter.The positive detection rate is high in infants and boys.Attention should be paid to the protection of key populations in corresponding seasons.

Objective By population survey,to explore the epidemiological characteristics of gastric precancerous lesions in Lishui District of Nanjing and provide objective basis for the prevention and treatment of early gastric cancer.Methods From July 2021 to December 2022,21 977 patients who received endoscopy and/or 13C-UBT in Lishui District People's Hospital and 6 medical community units in Nanjing City were retrospectively analyzed for demography characteristics,detection rate of gastric precancerous lesions,and H.Pylori infection rate.Results(1)590 cases of gastric precancerous lesions were detected(detection rate 2.68%);(2)The total detection rate of precancerous lesions and three pathological types in males were all higher than those in females(all P<0.001);(3)The minimum age for the total detection rate of precancerous lesions in males and the mini-mum age for each pathological type were lower than in females(P<0.001,0.009,0.005,0.002);(4)The popu-lation total H.pylori infection rate was 23.10%,the H.pylori infection rate in patients with precancerous lesions was higher than that in non-precancerous lesions(P<0.001),both H.pylori infection rate of male and female in precancerous lesions were all higher than those of non-precancerous lesions of the same sex(all P<0.001),in addition,the H.pylori infection rate of male whether in precancerous or non-precancerous lesions was higher than that of female(all P<0.001);(5)The precancerous lesions detection rate in male,female,and the overall age range of 20～29 to 70～79 years is positively correlated with age growth(P<0.001),and rapidly decreases after the age of 79,the of H.pylori infection rate was also positively correlated with age growth(P<0.001),and the trend of age change(P<0.001)was parallel to the precancerous lesions detection rate.Conclusions The detec-tion rate of gastric precancerous lesions in this region is above the average level in China;the total H.pylori infec-tion rate is at a relatively low level in China;the H.pylori infection rate is parallel to the age trend of the detection rate of gastric precancerous lesions,and increases with age.

Objective:In order to understand the current situation of air toxic substances without occupational exposure limits (OELs) in the workplace in the Germany GESTIS Substance Database, and to provide an effective reference for formulating OELs of corresponding toxic substances and improving health standards.Methods:From March 2022 to May 2023, based on the standard of GBZ 2.1-2019 Occupational Exposure Limits for Hazardous Agents in the Workplace-Part 1: Chemical Hazardous Agents, air toxic substances without OELs in the standard of GBZ/T 300.1-2017 Determination of Toxic Substances in Workplace Air-Part 1: General Principles were screened out, then corresponding OELs in other countrie/regions were queried through the Germany GESTIS Substance Database.Results:Among the 333 kinds (classes) of air toxic substances in 160 parts of GBZ/T 300.1-2017 standard, 48 kinds (classes) of air toxic substances were screened out and had not yet been formulated OELs in GBZ 2.1-2019 standard. By querying the Germany GESTIS Substance Database, it was found that among the 48 kinds (classes) of air toxic substances, 35 kinds (classes) of air toxic substances had both 8-hour occupational exposure limit and short-term occupational exposure limit, 4 kinds (classes) of air toxic substances had 8-hour occupational exposure limit but no short-term occupational exposure limit, 9 kinds (classes) of air toxic substances hadn't been retrieved any OELs. In addition, standard test methods of 7 kinds of air toxic substances hadn't been published in the present, including trimethylchlorosilane, trimethylbenzenes, cumene, chloroethane, chloropropane, dibromoethane and acetophenone.Conclusion:In the process of formulating or revising the standards of GBZ 2.1-2019 and GBZ/T 300, the latest published OELs in the Germany GESTIS Substance Database could be used as a reference basis.

Objective:In order to understand the current situation of air toxic substances without occupational exposure limits (OELs) in the workplace in the Germany GESTIS Substance Database, and to provide an effective reference for formulating OELs of corresponding toxic substances and improving health standards.Methods:From March 2022 to May 2023, based on the standard of GBZ 2.1-2019 Occupational Exposure Limits for Hazardous Agents in the Workplace-Part 1: Chemical Hazardous Agents, air toxic substances without OELs in the standard of GBZ/T 300.1-2017 Determination of Toxic Substances in Workplace Air-Part 1: General Principles were screened out, then corresponding OELs in other countrie/regions were queried through the Germany GESTIS Substance Database.Results:Among the 333 kinds (classes) of air toxic substances in 160 parts of GBZ/T 300.1-2017 standard, 48 kinds (classes) of air toxic substances were screened out and had not yet been formulated OELs in GBZ 2.1-2019 standard. By querying the Germany GESTIS Substance Database, it was found that among the 48 kinds (classes) of air toxic substances, 35 kinds (classes) of air toxic substances had both 8-hour occupational exposure limit and short-term occupational exposure limit, 4 kinds (classes) of air toxic substances had 8-hour occupational exposure limit but no short-term occupational exposure limit, 9 kinds (classes) of air toxic substances hadn't been retrieved any OELs. In addition, standard test methods of 7 kinds of air toxic substances hadn't been published in the present, including trimethylchlorosilane, trimethylbenzenes, cumene, chloroethane, chloropropane, dibromoethane and acetophenone.Conclusion:In the process of formulating or revising the standards of GBZ 2.1-2019 and GBZ/T 300, the latest published OELs in the Germany GESTIS Substance Database could be used as a reference basis.

Objective The objective of this study is to examine the expression level of the S100A7A protein in both gastric cancer tissues and cells,as well as to evaluate its impact on the malignant phenotype of gastric cancer(GC)cells.Methods Immunohistochemical assay was used to detect the expression characteristics of S100A7A in 21 gastric cancer tissues and their corresponding paracancerous tissues,as well as to investigate its correlation with gastric cancer clinicopathological factors.Gastric cancer cells were genetically modified to overex-press S100A7A through plasmid transfection.Subsequently,the impact of S100A7A on the proliferation,migra-tion,and invasion capacities of gastric cancer cells was assessed using cell proliferation assays(EdU assay and plate cloning assay)as well as cell migration and invasion assays(Transwell assay and scratch assay).Results The expression of S100A7A protein was higher in GC tissues than in paracancerous tissues;Overexpression of S100A7A may increase gastric cancer cell proliferation,migration,and invasion.Conclusion S100A7A is a possible oncogene in GC and is predicted to serve as a new diagnostic and therapeutic target for the disease.

Objective To observe the value of real-time shear wave elastography(SWE)combined with biochemical indicators for evaluating liver injury in patients with chronic kidney disease(CKD).Methods Totally 210 patients with CKD(CKD group)and 64 healthy subjects(control group)were retrospectively enrolled.Patients in CKD group were further divided into CKD1-5 subgroups according to CKD stages.SWE parameters of liver and kidney,including mean value,the maximum value and the median value of Young's modulus(EQImean,EQImax and EQImed)were compared between CKD subgroups and control group.Spearman correlation analysis were performed to explore the correlations of liver and kidney SWE parameters with CKD stage,as well as of liver SWE parameters with biochemical indicators.Multivariate logistic regression analysis was used to screen independent predictors of liver injury in CKD patients.Receiver operating characteristic curves were drawn,the area under the curves(AUC)were calculated to evaluate the efficacy of the independent predictors alone and their combination for assessing liver injury in CKD patients.Results Significant differences of liver and kidney SWE parameters were found among CKD subgroups and control group(all P≤ 0.001).Pairwise comparison showed that liver SWE parameters in CKD5 subgroup and liver EQImax in CKD4 subgroup were all higher than those in control group(all P＜0.003).Kidney SWE parameters in CKD3 subgroup were all higher than those in control group,while in CKD4 subgroup were all higher than those in control group and CKD1-3 subgroup(all P＜0.003).Kidney EQImean and EQImed in CKD5 subgroup were all higher than those in control group and CKD1-4 subgroup,while kidney EQImax in CKD5 subgroup were higher than those in control group and CKD1-3 subgroup(all P＜0.003).Liver and kidney SWE parameters were lowly-moderately and positively correlated with CKD stages(r=0.364-0.665,all P＜0.001).Liver SWE parameters of CKD were weakly and positively correlated with alkaline phosphatase(ALP)(r=0.229-0.248,all P＜0.01).The γ-glutamyl transferase,ALP and liver EQImax were all independent predictors of liver injury in CKD patients(all P＜0.01),with AUC for evaluating liver injury in CKD patients alone of 0.645,0.756 and 0.741,respectively,lower than that of their combination(0.851,all P＜0.01).Conclusion Real-time SWE combined with liver function indicators could reflect degree of liver injury in patients with different CKD stages.

Objective To investigate the positive detection and epidemic characteristics of enter ovirus(EV),the pathogen of hand-foot-mouth disease(HFMD),in Hangzhou,and to provide scientific basis for formulating prevention and control strategies of HFMD in the future.Methods From January 2016 to December 2022,14 259 positive cases of enterovirus universal nucleic acid detected in Hangzhou Children's Hospital were collected and analyzed retrospectively by age,gender,detection time and other factors.Results The average positive detection rate of EV was 45.48%(14 259/31 354),among which the positive detection rate of boys was 27.20%and that of girls was 18.28%,the difference was statistically significant(P<0.01).The positive detection rate of EV in children of different ages decreased with the increase of age,and the positive detection rate of EV in children under 5 years old accounted for 90.38%of all positive children.Seasonally,enteroviruses were detected throughout the year,but the incidence was high in summer,and the total positive number from May to July accounted for 49.16%of the total detected number.In terms of year,the positive detection rate of EV has shown a downward trend year by year since 2016.Conclusion There are gender differences in enterovirus infection in Hangzhou,and boys are more susceptible to enterovirus infection,especially children under 5 years old need to pay attention to EV protection.In addition,HFMD has a certain seasonality,with a high incidence in summer,and the annual detection rate has declined year by year since 2016,which may be related to the promotion of vaccines and the improvement of health awareness.

The most reliable and convenient measurement method of tibial posterior slope(TPS) and its biomechanical relationship with posterior cruciate ligament (PCL) are still controversial. For X-ray measurement, it is recommended to use full-length lateral X-ray of the lower extremity in quatrous section, which has advantage of highly repeatable and common in the daily diagnosis and treatment process, but it is only applicable to patients with tibial rotation within 15°. When the rotation exceeds 30°, it is difficult to identify the inner contour of platform and is no applicable. If it is only used for daily diagnosis and treatment evaluation, when tibial rotation angle is less than 15°, lateral knee X-ray also has a certain reference significance, but the accuracy could not meet requirements of higher clinical research. For CT measurement method, it could correct tibial rotation, but using the fitting point to measure tibial posterior slope on three-dimensional CT reconstruction is only applicable to knee joint without degeneration, more osteophyte affects the way of using fitting point to determine the plane of tibia with real tibia platform conformity degree, have some limitations. For measurement of MRI, it could not only correct tibial rotation, but also minimize the effect of osteophytes by using tibial anatomical axis as the reference axis, which is a good measurement method. For the biomechanical relationship between tibial posterior slope and tibial posterior slope, increased tibial posterior slope indirectly alleviates tension of PCL through tibial anterior displacement or directly reduces load on posterior cruciate ligament in tibial osteotomies, suggesting a protective mechanism for tibial posterior slope;in total knee arthroplasty with cruciate ligament preserved, the size of tibial posterior slope will affect roll back mechanism of femur. When affected knee with PCL injury, it should be avoid to release then aggravate injury, and the stress could be alleviated by increasing tibial posterior slope appropriately. There has been no unified conclusion on the range of tibial posterior slope that is most beneficial to PCL. The natural tibial posterior slope is between 7 ° and 10°, which is considered to be the most beneficial to protection of PCL, but further studies are needed according to the differences in patients' bone status, surgical methods and so on.
Arthroplasty, Replacement, Knee/methods* ; Femur/surgery* ; Humans ; Knee Joint/surgery* ; Osteophyte/surgery* ; Posterior Cruciate Ligament/surgery* ; Tibia/surgery*

ObjectiveTo establish the determination for index components in benchmark samples of Erdongtang， and clarify the content and transfer rate rages of index components in 15 batches of benchmark samples， and to explore the quantity transfer of index components of decoction pieces to benchmark samples. MethodFifteen batches of benchmark samples were prepared， the contents of mangiferin， baicalin and glycyrrhizic acid were determined by high performance liquid chromatography （HPLC）-diode array detector （DAD）， the mobile phase was acetonitrile （A）-0.1% formic acid aqueous solution （B） for gradient elution （0-10 min， 10%-17%A； 10-25 min， 17%-19%A； 25-28 min， 19%-25%A； 28-45 min， 25%-33%A； 45-46 min， 33%-45%A； 46-60 min， 45%-55%A）， detection wavelength was set at 254 nm. Contents of timosaponin BⅡ and the sum of protoneodioscin and protodioscin were determined by HPLC-evaporative light scattering detector （ELSD）， the mobile phase was acetonitrile （A）-water （B） for gradient elution （0-20 min， 24%A； 20-25 min， 24%-27%A； 25-33 min， 27%-28%A； 33-36 min， 28%-90%A； 36-41 min， 90%-24%A）. ResultThe methodological verification of the established method was good， which could be used for determination of five index components in benchmark samples. The content ranges of mangiferin， baicalin， glycyrrhizic acid， timosaponin BⅡ， and the sum of protoneodioscin and protodioscin in 15 batches of benchmark samples of Erdongtang were 0.14%-0.23%， 2.40%-3.37%， 0.07%-0.44%， 0.43%-0.95%， and 0.15%-0.47%， the transfer rate ranges of them were 33.90%-52.15%， 84.46%-105.61%， 22.59%-93.86%， 38.07%-61.43%， and 53.28%-96.11%， respectively. ConclusionThe consistencies of transfer rate of mangiferin， baicalin， timosaponin BⅡ and the sum of protoneodioscin and protodioscin （except glycyrrhizic acid） between decoction pieces and benchmark samples of Erdongtang are good， indicates that the transfer rates of 4 index components are stable during the preparation process of benchmark samples， which can provide data support for research and development of the compound preparation of this formula.

Objective The knowledge of cervical cancer prevention and control，the cognition of human papillomavirus (HPV) vaccine and the willingness to vaccinate HPV vaccine among college students in Xiangyang were investigated and analyzed to provide a reliable scientific basis for the primary prevention of cervical cancer prevention and control in Xiangyang. Methods By means of stratified sampling method and self-made questionnaire, this paper conducted a questionnaire survey among college students in 3 universities in Xiangyang. Results A total of 8 523 college students participated in the questionnaire survey, and 4 473 of them had sufficient knowledge of cervical cancer prevention and control and HPV vaccine, with the awareness rate of 52.48%. Male students, rural residents and non-medical majors were the influencing factors of insufficient knowledge of cervical cancer prevention and control and HPV vaccine. Among the 6 459 female college students who participated in the survey, 5,993 (92.79%) were willing to be vaccinated, and 859 (13.30%) were already vaccinated. Major, educational background, living expenses and cognitive scores were the influencing factors of HPV vaccination intention. Conclusion College students in Xiangyang City are relatively deficient in the knowledge of cervical cancer prevention and control and HPV vaccine. Targetable science popularization and education can improve college students' correct understanding of cervical cancer prevention and control knowledge, promote the HPV vaccine vaccination plan, and reduce the occurrence of HPV-related diseases and cervical cancer.