Objective To gain insights into the biological characteristics of different populations of Culex tritaeniorhynchus within and around the Yellow Sea wetland from the perspective of the occurrence of resistance, we investigated the levels of resistance to deltamethrin and kdr gene mutation in the wetland and its peripheral areas. Methods Specimens were collected from Cx. tritaeniorhynchus populations at two monitoring sites in the Rare Bird National Nature Reserve and Tiaozi Ni Wetland Scenic Area, and also from two populations in Yancheng City and the Liuhe District of Nanjing, and the resistance of these mosquitoes to deltamethrin was determined using the CDC biotest bottle method. For each concentration of deltamethrin assessed, a random subset of exposed specimens was selected for amplification of the kdr gene fragment, followed by Sanger sequencing to identify and analyze resistance-associated mutations. Results The LC50 levels of deltamethrin among mosquitoes from the four populations in Luhe, Yancheng, the Rare Bird National Nature Reserve and the Tiaozi Ni Wetland Scenic Area were 2.048 5, 7.798 2, 3.473 3, and 17.695 5 mg/mL, respectively, with corresponding concentrations of deltamethrin ranging from 0.005 to 5.000,0.050 to 50.000,0.050 to 25.000 and 0.050 to 50.000 mg/mL, respectively. Furthermore, the ranges of the KT50 values were 11.76-107.43, 67.05-216.30,29.77-107.43 and 28.40-329.51 min; the 1-h knockdown rates were 34.58%-99.15%, 9.52%-43.80%, 55.09%-73.01%, and 10.09%-68.07%; and the 24-h mortality rates were 12.15%-67.52%,9.52%-79.56%,13.17%-82.21%, and 11.01%-78.99%, respectively. With respect to kdr gene mutation, we assayed a total of 63,70,59, and 57 mosquitoes for the four populations, for which we detected L1014F mutation frequencies of 14.29%, 35.00%, 20.34%, and 31.58%, respectively, with a majority of these mutations being heterozygous for resistance. In addition, five adult mosquitoes were identified has having synonymous mutations at site 1011[i. e. , AAT(asparagine)mutation to AAC(asparagine)]. Conclusions Our findings revealed the clear resistance of Cx. tritaeniorhynchus to deltamethrin in the Yancheng region of the Yellow Sea wetland, and the resistance phenotype and kdr frequency of Cx. tritaeniorhynchus in the wetland environment were comparable to those of Cx. tritaeniorhynchus in the wetland environment, thereby indicating that the resistance of different populations of Cx. tritaeniorhynchus was homogeneous under the pressure of different insecticide selection within and around the wetland. However, the underlying mechanisms need to be further studied.

Objective: To analyze the dynamic changes and influencing factors of latent tuberculosis infection (LTBI) among junior and senior high school students, so as to provide evidence based references for precise tuberculosis prevention and control on campus. Methods: A retrospective cohort study was conducted among 11 206 junior and senior high school students in Yuhang District, Hangzhou, who underwent tuberculin skin test (TST) at baseline in 2023 (T0). Participants were followed up for two consecutive years (T1 in 2024, T2 in 2025), and TST results were analyzed. Cox proportional hazards regression model was used to identify influencing factors of LTBI, and generalized estimating equations (GEE) were applied to examine the sex-baseline grade-time interaction effects. Results: The cumulative incidence of LTBI among enrolled students was 10.01%, showed a distinct grade related gradient: the grade 7 cohort had the highest cumulative incidence of 12.62%, which decreased significantly with increasing grade level ( χ 2=109.12, P <0.01). Multivariate Cox regression analysis indicated that, compared with the grade 7 cohort, the grade 8 cohort ( aHR =0.60) and the grade 9 cohort ( aHR =0.43) had lower risks of LTBI (both P <0.01). Boarding school students had a 62% lower risk of LTBI than non boarding school students ( aHR =0.38, P <0.01). GEE analysis showed that, with grade 7 girls at T1 as the reference group, LTBI risk significantly increased among grade 7 girls at T2 ( β =0.23), whereas the most prominent risk reduction was observed among grade 9 boys ( β =-1.69) (both P <0.05). Conclusions LTBI risk among junior and senior high school students exhibits significant population heterogeneity and temporal dynamics. The grade 7 academic year represents a critical window for tuberculosis prevention. Girls advancing to the grade 8 should be prioritized as the key population for targeted interventions. The boarding school campus management model exerts a protective effect against LTBI among junior and senior high school students.

Objective: To explore the current situation and influencing factors of latent tuberculosis infection (LTBI) among middle school students in Yuhang District, Hangzhou City, so as to provide evidence for optimizing targeted school tuberculosis prevention and control strategies. Methods: The study targeted students in grades 7 through 11 in Yuhang District from 2023 to 2025. LTBI screening was conducted annually from September to November using the tuberculin skin test. Basic data, such as the year of screening and gender, were collected through the Yuhang District Public Health Emergency Intelligent Control System, while information on school type and boarding status was gathered from the schools themselves. A multivariable logistic regression model was used to analyze the influencing factors for LTBI among middle school students. Results: A total of 102 092 person-tims middle school students were screened, including 54 015 person-tims of boys (52.91%) and 48 077 person-tims of girls (47.09%). LTBI was detected in 6 913 person-tims, with a detection rate of 6.77%. Multivariable logistic regression analysis showed that screenings conducted in 2024-2025 (2024, OR=1.123, 95%CI: 1.055-1.196; 2025, OR=1.255, 95%CI: 1.181-1.334), girls (OR=1.146, 95%CI: 1.092-1.204), and students in grades 8 through 11 (grade 8, OR=1.707, 95%CI: 1.588-1.836; grade 9, OR=1.634, 95%CI: 1.515-1.762; grade 10, OR=1.713, 95%CI: 1.574-1.864; grade 11, OR=1.691, 95%CI: 1.549-1.846) had a higher risk of LTBI; students in boarding schools (OR=0.619, 95%CI: 0.575-0.666) had a lower risk of LTBI. Conclusion The prevalence of LTBI among middle school students in Yuhang District is relatively high, primarily due to the year of screening, gender, grade level, and boarding school.

Biofilm is one of the important reasons for bacterial resistance and persistent infection in Staphylococcus aureus,which poses a significant threat to the dairy farming industry in southern Xinjiang.Although quercetin has antibacterial properties,its poor hydrophilicity and low solubility limit its clinical application.Therefore,quercetin nanogel was prepared by the electrostatic interac-tion between guar gum(positive charge)and hyaluronic acid(negative charge)under the action of sodium tripolyphosphate in this study.Using encapsulation efficiency and loading capacity as indi-cators,the optimal formula was screened through single factor experiments and response surface methodology,and characterized.The minimal inhibitory concentration(MIC)and minimal mem-brane inhibitory concentration(MBIC)of quercetin nanogel against Staphylococcus aureus were determined by micro broth dilution method and micro plate semi quantitative method.The results showed that the optimal formulation of quercetin nanogel was 11.6 g/L guar gum,10.0 g/L hyalu-ronic acid and 50.0 g/L sodium tripolyphosphate.The encapsulation efficiency and loading capacity were 79.4％and 7.6％,respectively.The particle size and Zeta potential were(396.0±4.2)nm and(-25.0±0.8)mV,respectively,indicating that the nanogel had good dispersion,high stability and excellent drug loading capacity.The MIC and inhibitory rate of quercetin nanogel against Staphy-lococcus aureus were 8.0 mg/L and 83.8％,respectively.The MBIC and inhibitory rate of quercetin nanogel against Staphylococcus aureus were 8.0 mg/L and 38.3％,respectively.Therefore,the pre-pared quercetin nanogel solved the problems of low solubility and poor hydrophilicity of quercetin,improved the inhibitory effect of quercetin on the membrane of Staphylococcus aureus,and was expected to be further applied to the treatment of cow bacterial diseases in southern Xinjiang.

High altitude heart disease(HAHD)is a chronic mountain sickness in which the body is exposed to high altitude(＞2 500 m)hypobaric hypoxia environment for a long time.HAHD has high morbidity and poor prognosis,and pulmonary hypertension is the main causative mechanism for its develop-ment.The phosphodiesterase-5 inhibitor sildenafil has become a hot drug for the treatment of pulmonary hypertension.This paper reviews the progress of HAHD and discusses the mechanism of action and effectiveness of sildenafil in the treatment of HAHD,with a view to providing a basis for the treatment of HAHD with sildenafil.

Biofilm is one of the important reasons for bacterial resistance and persistent infection in Staphylococcus aureus,which poses a significant threat to the dairy farming industry in southern Xinjiang.Although quercetin has antibacterial properties,its poor hydrophilicity and low solubility limit its clinical application.Therefore,quercetin nanogel was prepared by the electrostatic interac-tion between guar gum(positive charge)and hyaluronic acid(negative charge)under the action of sodium tripolyphosphate in this study.Using encapsulation efficiency and loading capacity as indi-cators,the optimal formula was screened through single factor experiments and response surface methodology,and characterized.The minimal inhibitory concentration(MIC)and minimal mem-brane inhibitory concentration(MBIC)of quercetin nanogel against Staphylococcus aureus were determined by micro broth dilution method and micro plate semi quantitative method.The results showed that the optimal formulation of quercetin nanogel was 11.6 g/L guar gum,10.0 g/L hyalu-ronic acid and 50.0 g/L sodium tripolyphosphate.The encapsulation efficiency and loading capacity were 79.4％and 7.6％,respectively.The particle size and Zeta potential were(396.0±4.2)nm and(-25.0±0.8)mV,respectively,indicating that the nanogel had good dispersion,high stability and excellent drug loading capacity.The MIC and inhibitory rate of quercetin nanogel against Staphy-lococcus aureus were 8.0 mg/L and 83.8％,respectively.The MBIC and inhibitory rate of quercetin nanogel against Staphylococcus aureus were 8.0 mg/L and 38.3％,respectively.Therefore,the pre-pared quercetin nanogel solved the problems of low solubility and poor hydrophilicity of quercetin,improved the inhibitory effect of quercetin on the membrane of Staphylococcus aureus,and was expected to be further applied to the treatment of cow bacterial diseases in southern Xinjiang.

High altitude heart disease(HAHD)is a chronic mountain sickness in which the body is exposed to high altitude(＞2 500 m)hypobaric hypoxia environment for a long time.HAHD has high morbidity and poor prognosis,and pulmonary hypertension is the main causative mechanism for its develop-ment.The phosphodiesterase-5 inhibitor sildenafil has become a hot drug for the treatment of pulmonary hypertension.This paper reviews the progress of HAHD and discusses the mechanism of action and effectiveness of sildenafil in the treatment of HAHD,with a view to providing a basis for the treatment of HAHD with sildenafil.

Objective: To describe fertility and explore factors associated with it among pre-conception couples of childbearing age. Methods: Based on the pre-conceptional offspring trajectory study of the School of Public Health of Fudan University, couples of childbearing age who participated in the pre-conception physical examination in Shanghai Jiading District from 2016 to 2021 were recruited and followed up. Couples' time to pregnancy (TTP) was analyzed and Cox proportional hazards regression model was used to explore the factors associated with TTP. Kaplan-Meier was used to calculate each menstrual cycle's cumulative pregnancy rate. Results: A total of 1 095 preconception couples were included in the analysis, the M(Q₁,Q₃)of TTP was 4.33 (2.41, 9.78) menstrual cycles. Age of women (FR=0.90, 95%CI: 0.85-0.95, P<0.001), women who were overweight or obese before pregnancy (FR=0.36, 95%CI: 0.24-0.55, P<0.001), women who were exposed to second-hand smoking (FR=0.63, 95%CI: 0.44-0.92, P=0.016), women whose home or office had been renovated in the past 2 years and had a particular smell (FR=0.46, 95%CI: 0.26-0.81, P=0.008) were risk factors for impaired fertility. Regular menstrual cycles (FR=1.64, 95%CI: 1.16-2.31, P=0.005), females who often drank tea/coffee (FR=1.55, 95%CI: 1.11-2.17, P=0.011) and males who took folic acid before conception (FR=2.35, 95%CI: 1.38-4.23, P=0.002) were associated with better fertility. The cumulative pregnancy rate of 3, 6, and 12 menstrual cycles was 37.6%, 64.4%, and 78.4%, respectively. Conclusion: Older couples, overweight or obesity before pregnancy, irregular menstruation, exposure to secondhand smoke and decoration pollutants in females are associated with impaired fertility. Frequent tea/coffee drinking before pregnancy in females and taking folic acid before pregnancy in males are associated with shortened conception time.
Pregnancy ; Male ; Humans ; Female ; Cohort Studies ; Overweight/complications* ; Coffee ; Intention ; China/epidemiology* ; Fertility ; Obesity/complications* ; Tea

To design a treatment plan for patients with epididymal obstruction, we explored the potential impact of factors such as body mass index (BMI) and age on the surgical outcomes of vasoepididymostomy (VE). In this retrospective study, 181 patients diagnosed with obstructive azoospermia (OA) due to epididymal obstruction between September 2014 and September 2017 were reviewed. All patients underwent single-armed microsurgical intussusception VEs with longitudinal two-suture placement performed by a single surgeon (KH) in a single hospital (Peking University Third Hospital, Beijing, China). Six factors that could possibly influence the patency rates were analyzed, including BMI, age, mode of anastomosis, site of anastomosis, and sperm motility and quantity in the intraoperative epididymal fluid. Single-factor outcome analysis was performed via Chi-square test and multivariable analysis was performed using logistic regression. A total of 159 (87.8%, 159/181) patients were followed up. The follow-up time (mean ± standard deviation [s.d.]) was 27.7 ± 9.3 months, ranging from 12 months to 48 months. The overall patency rate was 73.0% (116/159). The multivariable analysis revealed that BMI and age significantly influenced the patency rate (P = 0.008 and 0.028, respectively). Younger age (≤28 years; odds ratio [OR] = 3.531, 95% confidence interval [95% CI]: 1.397-8.924) and lower BMI score (<26.0 kg m^-2; OR = 2.352, 95% CI: 1.095-5.054) appeared to be associated with a higher patency rate. BMI and age were independent factors affecting the outcomes of microsurgical VEs depending on surgical expertise and the use of advanced technology.
Humans ; Male ; Adult ; Retrospective Studies ; Body Mass Index ; Epididymis/surgery* ; Vas Deferens/surgery* ; Treatment Outcome ; Sperm Motility ; Microsurgery ; Surgeons ; Vasovasostomy

Objective To investigate the prevalence and influencing factors of Enterobius vermicularis infections among children in Fanxian County, Henan Province in 2019, so as to provide insights into the management of enterobiasis. Methods Five kindergartens were selected in urban and rural areas of Fanxian County, Henan Province using the stratified sampling method in 2019, and a census of E. vermicularis infections was performed among all children in the kindergartens. E. vermicularis eggs were detected using adhesive and scotch cellophane-tape anal swab methods, and the basic characteristics of children and their families, health habits and the kindergartens’ information were investigated with questionnaires. Logistic regression analysis was used to investigate the risk factors and protective factors of pinworm infection in children. Results A total of 671 children were tested, and the mean prevalence of E. vermicularis infections was 15.50% (104/671). The prevalence of E. vermicularis infections was higher among children in rural kindergartens (28.13%, 72/256) than in urban kindergartens (7.71%, 32/415) (χ² = 50.380, P < 0.01), and greater in private kindergartens (32.26%, 60/186) than in public kindergartens (9.07%, 44/485) (χ² = 55.183, P < 0.01). There was no gender-specific prevalence of E. vermicularis infections among children (χ² = 1.442, P > 0.05), and the prevalence of E. vermicularis infections presented a tendency towards a rise with age (χ²_trend = 8.373, P < 0.05) and school grade (χ²_trend = 30.274, P < 0.05). Logistic regression analysis identified rural kindergartens and high grades as risk factors, and separate washing of children’s and adults’ cloths, frequent bathing and frequent dinnerware disinfection in kindergartens as protective factors for E. vermicularis infections among children. In addition, there was no significant difference in the detection of E. vermicularis infections among children by using adhesive (73.08%, 76/104) and scotch cellophane-tape anal swab methods (56.73%, 59/104) (χ² = 3.959, P > 0.05). Conclusions The prevalence of E. vermicularis infection is high among children in Fanxian Country, Henan Province. Health education and surveillance of enterobiasis are required to be intensified among children in rural kindergartens and senior grades and their parents and teachers.