Objective To understand the epidemiological characteristics of a clustered outbreak of severe fever with thrombocytopenia syndrome(SFTS)as well as the ecological tick monitoring results for Zibo City, and to provide a scientific basis for formulating prevention and control strategies. Methods A case definition was cited before epidemic investigations were performed. Epidemiological investigations were performed on the index cases and their close contacts. Blood samples were collected from cases and close contacts, and quantitative real-time RT-PCR was used to detect SFTS virus(SFTSV)nucleic acid sequences. A retrospective cohort study was conducted to analyze risk factors and develop prevention and control strategies. Results This clustered outbreak involved two index cases and six close contacts with no deaths. Case A exhibited symptom onset on July 26. SFTS was confirmed on August 2. Case B exhibited symptom onset on August 1, and SFTS was confirmed on August 3. Patient B reported a recent history of tick bites. In both index cases, the incubation period for SFTS was inferred to be 7-12 days. The time interval from symptom onset to clinical diagnosis in the two cases ranged from 2-8 days, with an average period of 5 days. SFTSV nucleic acid test result were positive for both patients, whereas all six close contacts tested negative. All captured ticks tested negative for SFTSV using quantitative real-time RT-PCR. The densities of parasitic and free-living ticks in the emergency monitoring area around the cases were 12.60 and 4.65 ticks/(flag·100 m). In 2024, the average parasitic tick index and free-living tick density index were 4.21 and 2.43 ticks/(flag ·100 m)in Yiyuan County, respectively. Conclusions No evidence of human-to-human transmission was found in the assessed SFTS clusters. The infections were likely acquired through tick bites during fieldwork, and the risk of a subsequent outbreak spreading was low.

Objective To explore the association and diagnostic performance of liver imaging reporting and data system(LI-RADS)CT signs with hepatocellular carcinoma(HCC)both in the LI-RADS target population and patients without LI-RADS-defined HCC risk factors.Methods A retrospective analysis was conducted on the data of 435 patients with 482 hepatic lesions confirmed by pathology.Of these,306 cases were assigned to the HCC group(327 HCC lesions),and other 129 cases were assigned to the non-HCC group(77 malignancies and 78 benign lesions).Receiver operating characteristic(ROC)curve analysis assessed the diagnostic performance of LI-RADS v2018 CT signs for HCC,and logistic regression analyses determined the association of CT signs with HCC.Results The asso-ciation of CT signs with all HCC lesions was statistically significant for non-peripheral washout[odds ratio(OR)15.1;95％ confi-dence interval(CI)5.6-40.4;P＜0.01]and non-rim arterial phase hyperenhancement(APHE)(OR 12.4;95％ CI 7.5-20.5;P＜0.01)higher than enhanced capsule(OR 9.9;95％ CI 2.8-34.8;P＜0.01;OR 2.4;95％ CI 1.4-3.8;P=0.01).The sensitivity,specificity,positive predictive value(PPV),and area under the curve(AUC)for diagnosing HCC were 85％,83％,91％,and 0.84,respectively for non-peripheral washout;82％,77％,88％ and 0.79,respectively for non-rim APHE;and 31％,98％,97％ and 0.65,respectively for enhanced capsule.Sensitivity(88％ vs 87％),specificity(83％ vs 82％),PPV(92％ vs 91％)and AUC(0.90 vs 0.87)were all slightly higher when non-peripheral washout,non-rim APHE,enhanced capsule,and ancillary features were combined for the diagnosis of HCC compared to combining the three major features.Enhanced capsule(OR 13.3;95％ CI 3.6-48.9;P＜0.01),blood products in mass(OR 20.3;95％ CI 2.4-171.4;P＜0.01),and mosaic appearance(OR 37.7;95％ CI 4.2-340.0;P＜0.01)were associations with HCC presenting with atypical imaging features and provided high specificity from 98％ to 99％.Conclusion In theLI-RADS target population and patients without LI-RADS-defined HCC risk factors,LI-RADS v2018 CT signs show excellent diag-nostic performance for HCC.Two ancillary features,blood products in mass and mosaic appearance,show good specificity for HCC with atypical imaging features.

Objective To explore the association and diagnostic performance of liver imaging reporting and data system(LI-RADS)CT signs with hepatocellular carcinoma(HCC)both in the LI-RADS target population and patients without LI-RADS-defined HCC risk factors.Methods A retrospective analysis was conducted on the data of 435 patients with 482 hepatic lesions confirmed by pathology.Of these,306 cases were assigned to the HCC group(327 HCC lesions),and other 129 cases were assigned to the non-HCC group(77 malignancies and 78 benign lesions).Receiver operating characteristic(ROC)curve analysis assessed the diagnostic performance of LI-RADS v2018 CT signs for HCC,and logistic regression analyses determined the association of CT signs with HCC.Results The asso-ciation of CT signs with all HCC lesions was statistically significant for non-peripheral washout[odds ratio(OR)15.1;95％ confi-dence interval(CI)5.6-40.4;P＜0.01]and non-rim arterial phase hyperenhancement(APHE)(OR 12.4;95％ CI 7.5-20.5;P＜0.01)higher than enhanced capsule(OR 9.9;95％ CI 2.8-34.8;P＜0.01;OR 2.4;95％ CI 1.4-3.8;P=0.01).The sensitivity,specificity,positive predictive value(PPV),and area under the curve(AUC)for diagnosing HCC were 85％,83％,91％,and 0.84,respectively for non-peripheral washout;82％,77％,88％ and 0.79,respectively for non-rim APHE;and 31％,98％,97％ and 0.65,respectively for enhanced capsule.Sensitivity(88％ vs 87％),specificity(83％ vs 82％),PPV(92％ vs 91％)and AUC(0.90 vs 0.87)were all slightly higher when non-peripheral washout,non-rim APHE,enhanced capsule,and ancillary features were combined for the diagnosis of HCC compared to combining the three major features.Enhanced capsule(OR 13.3;95％ CI 3.6-48.9;P＜0.01),blood products in mass(OR 20.3;95％ CI 2.4-171.4;P＜0.01),and mosaic appearance(OR 37.7;95％ CI 4.2-340.0;P＜0.01)were associations with HCC presenting with atypical imaging features and provided high specificity from 98％ to 99％.Conclusion In theLI-RADS target population and patients without LI-RADS-defined HCC risk factors,LI-RADS v2018 CT signs show excellent diag-nostic performance for HCC.Two ancillary features,blood products in mass and mosaic appearance,show good specificity for HCC with atypical imaging features.

Aim To compare the observation results of atomic force microscopy(AFM)and scanning electron microscopy(SEM),and to summarize the main problems and solutions of AFM in observing biological macromolecules,using the observa-tion subjects of protein samples purified by our research group.Methods The protein samples were diluted to 15 nmol·L-1 with PBS,fixed on glass slides,silicon wafers,and mica sheets,dried,and made into solid-phase observation samples.SEM sam-ples were plated with platinum before observation.The surface structures of proteins were observed using AFM and SEM,sample heights were calculated,and differences in results were com-pared.Results Protein samples with positive charges tended to shift to the right during observation due to the repulsion of the AFM probe;mica sheets could effectively eliminate the positive charge of proteins to avoid sample movement;PBS provided a stable environment for protein samples,but the crystallization of PBS salts interfered with probe operation and imaging clarity;SEM samples needed to be plated with platinum before observa-tion and could not achieve the precision of AFM.Conclusions Both AFM and SEM can directly observe protein structures in vitro,with AFM providing higher precision results;when protein sample stability permits,ultrapure water is preferred as the sol-vent carrier,and volatile liquids such as ethanol can also serve as solvent carriers.The application of AFM offers a new approach for pharmacological studies on interactions between biological macromolecules.

Aim To investigate the effects of rosavin on hepatocellular steatosis and its mechanism of action.Methods AML-12 and HepG2 cells were induced to undergo hepatocellular steatosis by free fatty acids(FFA),and the optimal inducing concentration was determined by oil red O staining and CCK-8 assay.The cell activity was detected by CCK-8 assay after ro-savin treatment,and the lipid droplet accumulation was observed by oil red O staining.The levels of triglycer-ide(TG),total cholesterol(TC),glutamic oxalacetic transaminase(AST),glutamic pyruvic transaminase(ALT),superoxide dismutase(SOD),glutathione per-oxidase(GSH-Px),and malondialdehyde(MDA)were detected by kits.The potential targets of rosavin in non-alcoholic fatty liver disease(NAFLD)were ana-lyzedby network pharmacology and molecular docking,and the expression of core candidate targets before and after the rosavin intervention was detected by real-time fluorescence quantitative PCR.Results Hepatocyte steatosis was induced by FFA,and the intervention of rosavin(25,50 μmol·L-1)reduced the number of intracellular lipid droplets in hepatocytes in a dose-de-pendent manner,also lowered the cellular levels of TG,TC,AST,ALT,elevated the levels of SOD and GSH-Px,and reduced the levels of MDA.Network pharma-cological analysis and molecular docking yielded five core candidate targets:NOS3,MAPK14,PPARG,TNF-α,and IGF-1,and real-time fluorescence quantitative PCR showed that the action of loxavir significantly re-duced the gene expression of TNF-α and PPARG in hepatocytes after FFA induction.Conclusions Rosa-vin can attenuate the inflammatory response,oxidative stress level,and lipid accumulation in hepatocytes by modulating TNF-α and PPARG,thereby ameliorating FFA-induced hepatocellular steatosis.

Estrogen, through binding to its receptors in the female endometrium, promotes the proliferation, differentiation, and angiogenesis of endometrial stromal cells, thereby playing a critical role in endometrial injury repair, regeneration, and the prevention and treatment of intrauterine adhesions. Currently, various estrogen-based pharmaceutical formulations are applied in clinical practice, and the development of related products is progressively advancing. This review systematically outlines the etiology of endometrial injury and the mechanisms by which estrogen facilitates endometrial repair and regeneration. Furthermore, it highlights recent research progress and clinical applications of estrogen-based therapies in endometrial regeneration, aiming to provide a valuable reference for relevant scientific research and clinical practice.

Objective:To evaluate the clinical value and safety of an intraperitoneal chemotherapy port technique in patients with gastric cancer and peritoneal metastases undergoing intraperitoneal chemotherapy.Methods:This was a retrospective, descriptive case analysis. From November 2022 to October 2024, patients diagnosed with gastric cancer and peritoneal metastases at Wuxi Branch of Ruijin Hospital, Shanghai Jiao Tong University School of Medicine with an expected survival >3 months, underwent laparoscopic exploration combined with implantation of an intraperitoneal chemotherapy port [PORT-A-CATH II system (Model 21-4055-24)] implantation. The procedure was as follows: (1) after laparoscopic exploration, a 4-cm skin incision was made at a predetermined site and a subcutaneous pocket created by dissecting to the muscle fascia and removing subcutaneous fat as needed to position the port septum 0.5-1.0 cm from the skin surface; (2) under direct laparoscopic visualization, the abdominal cavity was punctured and a guidewire inserted, followed by an 8.5 Fr sheath, through which a catheter with three trimmed side holes was placed after removal of the sheath; (3) the catheter length in the abdominal cavity was adjusted to 25–30 cm and the catheter trimmed, and connected to the port base, ensuring it extended beyond the connector's visible hole; (4) the whole port was placed within the subcutaneous pocket, and non-absorbable sutures used to create a double purse-string suture at the catheter's abdominal entry, forming an anti-reflux ring; (5) non-absorbable sutures were used to securely fix the port to the fascia through its four base holes and the exposed catheter segments on the fascia sutured and buried; (6) patency was confirmed by injecting saline and followed by intermittent skin closure provided there was no bleeding; and (7) the catheter tip was positioned in the pelvic cavity under laparoscopic guidance. Postoperatively, the patients underwent normothermic intraperitoneal and systemic treatment. The port infusion protocol involved disinfecting the skin (>10 cm diameter) around the port, confirming the puncture site, inserting a Huber needle vertically at 90° to the port base, infusing 100 mL saline to ensure patency, followed by continuous infusion of 1000 mL paclitaxel solution, and sealing with 20 mL saline before removing the needle. No saline flushing was required between chemotherapy infusions. The primary outcomes were the incidence and management of complications post-port implantation.Results:The study cohort comprised 225 patients with gastric cancer and peritoneal metastases. Using standardized port implantation and postoperative puncture procedures, the complication rate during follow-up was 14.2% (32/225), including effusion in 14 patients (6.2%), port infection in 10 (4.4%), incision dehiscence in four (1.8%), port inversion in two (0.9%), hematoma in one (0.4%), and catheter rupture in one (0.4%). Seventy-five percent (24/32) of patients with complications recovered and continued using the port after conservative treatments (e. g., aspiration of effusions, antibiotic therapy, incision management), whereas the remaining 25.0% (8/32) with complications required surgical removal of the port because the treatment was ineffective. The presence of preoperative ascites ( P=0.019) and peritoneal cancer index score>15 ( P=0.038) were significantly associated with development of complications. Conclusions:Our standardized procedure for intraperitoneal chemotherapy port implantation is safe and feasible for patients with gastric cancer and peritoneal metastases, having a low overall complication rate. Most complications can be successfully managed with conservative treatment, the device thus providing reliable support for intraperitoneal chemotherapy.

Objective:Based on multivariate analysis of the influencing factors of fecal pollution after radical re-section in children with congenital megacolon,a risk prediction model was constructed and evaluated.Methods:A total of 200 children with Hirschsprung's disease who underwent radical surgery at Nanyang Central Hospital of Henan Province from June 2020 to June 2023 were selected,and all children were followed up for 1 year.According to the occurrence of postoperative fecal incontinence,the children were divided into the non-occurrence group and the oc-currence group.Univariate Logistic regression analysis was performed on all possible influencing factors,and the back-ward stepwise regression method was used to screen out the relevant factors affecting postoperative fecal inconti-nence in children with Hirschsprung's disease after radical surgery.A risk prediction model was constructed based on these relevant factors,and its efficacy was verified using calibration curves,the Hosmer-Lemeshow test,and ROC curves.Results:Postoperative fecal incontinence occurred in 19.50%(39/200)of the children.A statistically signifi-cant difference was observed between the non-occurrence group and the occurrence group in terms of the following data(P＜0.05):age,preoperative nutritional support,need for auxiliary defecation before surgery,length of the dis-eased intestinal segment,educational level of caregivers,preoperative hypoproteinemia,resection range,postoperative diet compliance of the children,postoperative defecation training of the children,postoperative enterocolitis,and post-operative anal dilatation therapy.Multivariate Logistic regression analysis showed that preoperative nutritional support,need for auxiliary defecation before surgery,length of the diseased intestinal segment,educational level of caregivers,postoperative diet compliance of the children,postoperative defecation training of the children,postoperative entero-colitis,and postoperative anal dilatation therapy were all independent influencing factors for postoperative fecal inconti-nence in children with Hirschsprung's Disease after radical surgery(P＜0.05).Among these factors,the educational level of caregivers was the strongest predictor of postoperative fecal incontinence in children with Hirschsprung's dis-ease after radical surgery.Results of the calibration curve showed that the concordance index of the risk prediction model for postoperative fecal incontinence in children with Hirschsprung's Disease after radical surgery was 0.837.The Hosmer-Lemeshow test results indicated no statistically significant difference between the predicted values and the actual values of risk prediction(P＜0.05),suggesting that the model had a good fit and high prediction accuracy.Re-sults of the ROC curve showed that the area under the curve(AUC)of the risk prediction model for predicting postop-erative fecal incontinence in children with Hirschsprung's Disease after radical surgery was 0.887(95%CI:0.762～1.000,P＜0.05),with a sensitivity of 0.914,a specificity of 0.763,and a Youden index of 0.677.These findings indicate that the risk prediction model has moderate discriminative ability and good predictive performance.Conclusion:Preop-erative nutritional support,need for auxiliary defecation before surgery,length of the diseased intestinal segment,edu-cational level of caregivers,postoperative diet compliance of children,postoperative defecation training of children,postoperative enterocolitis,and postoperative anal dilatation therapy are all independent influencing factors for postop-erative fecal incontinence in children with Hirschsprung's disease after radical surgery.The risk prediction model for postoperative fecal incontinence in children with Hirschsprung's disease after radical surgery,established based on multivariate analysis,is helpful for early identification of high-risk groups and timely implementation of individualized in-tervention measures.

Objective:Based on multivariate analysis of the influencing factors of fecal pollution after radical re-section in children with congenital megacolon,a risk prediction model was constructed and evaluated.Methods:A total of 200 children with Hirschsprung's disease who underwent radical surgery at Nanyang Central Hospital of Henan Province from June 2020 to June 2023 were selected,and all children were followed up for 1 year.According to the occurrence of postoperative fecal incontinence,the children were divided into the non-occurrence group and the oc-currence group.Univariate Logistic regression analysis was performed on all possible influencing factors,and the back-ward stepwise regression method was used to screen out the relevant factors affecting postoperative fecal inconti-nence in children with Hirschsprung's disease after radical surgery.A risk prediction model was constructed based on these relevant factors,and its efficacy was verified using calibration curves,the Hosmer-Lemeshow test,and ROC curves.Results:Postoperative fecal incontinence occurred in 19.50%(39/200)of the children.A statistically signifi-cant difference was observed between the non-occurrence group and the occurrence group in terms of the following data(P＜0.05):age,preoperative nutritional support,need for auxiliary defecation before surgery,length of the dis-eased intestinal segment,educational level of caregivers,preoperative hypoproteinemia,resection range,postoperative diet compliance of the children,postoperative defecation training of the children,postoperative enterocolitis,and post-operative anal dilatation therapy.Multivariate Logistic regression analysis showed that preoperative nutritional support,need for auxiliary defecation before surgery,length of the diseased intestinal segment,educational level of caregivers,postoperative diet compliance of the children,postoperative defecation training of the children,postoperative entero-colitis,and postoperative anal dilatation therapy were all independent influencing factors for postoperative fecal inconti-nence in children with Hirschsprung's Disease after radical surgery(P＜0.05).Among these factors,the educational level of caregivers was the strongest predictor of postoperative fecal incontinence in children with Hirschsprung's dis-ease after radical surgery.Results of the calibration curve showed that the concordance index of the risk prediction model for postoperative fecal incontinence in children with Hirschsprung's Disease after radical surgery was 0.837.The Hosmer-Lemeshow test results indicated no statistically significant difference between the predicted values and the actual values of risk prediction(P＜0.05),suggesting that the model had a good fit and high prediction accuracy.Re-sults of the ROC curve showed that the area under the curve(AUC)of the risk prediction model for predicting postop-erative fecal incontinence in children with Hirschsprung's Disease after radical surgery was 0.887(95%CI:0.762～1.000,P＜0.05),with a sensitivity of 0.914,a specificity of 0.763,and a Youden index of 0.677.These findings indicate that the risk prediction model has moderate discriminative ability and good predictive performance.Conclusion:Preop-erative nutritional support,need for auxiliary defecation before surgery,length of the diseased intestinal segment,edu-cational level of caregivers,postoperative diet compliance of children,postoperative defecation training of children,postoperative enterocolitis,and postoperative anal dilatation therapy are all independent influencing factors for postop-erative fecal incontinence in children with Hirschsprung's disease after radical surgery.The risk prediction model for postoperative fecal incontinence in children with Hirschsprung's disease after radical surgery,established based on multivariate analysis,is helpful for early identification of high-risk groups and timely implementation of individualized in-tervention measures.

Aim To compare the observation results of atomic force microscopy(AFM)and scanning electron microscopy(SEM),and to summarize the main problems and solutions of AFM in observing biological macromolecules,using the observa-tion subjects of protein samples purified by our research group.Methods The protein samples were diluted to 15 nmol·L-1 with PBS,fixed on glass slides,silicon wafers,and mica sheets,dried,and made into solid-phase observation samples.SEM sam-ples were plated with platinum before observation.The surface structures of proteins were observed using AFM and SEM,sample heights were calculated,and differences in results were com-pared.Results Protein samples with positive charges tended to shift to the right during observation due to the repulsion of the AFM probe;mica sheets could effectively eliminate the positive charge of proteins to avoid sample movement;PBS provided a stable environment for protein samples,but the crystallization of PBS salts interfered with probe operation and imaging clarity;SEM samples needed to be plated with platinum before observa-tion and could not achieve the precision of AFM.Conclusions Both AFM and SEM can directly observe protein structures in vitro,with AFM providing higher precision results;when protein sample stability permits,ultrapure water is preferred as the sol-vent carrier,and volatile liquids such as ethanol can also serve as solvent carriers.The application of AFM offers a new approach for pharmacological studies on interactions between biological macromolecules.