The infection caused by SARS-CoV-2 is a very widespread epidemic disease. Rodent models have played an important role in studying the pathogenesis and immune response of SARS-CoV-2 infection, as well as in developing drugs or vaccines for treatment and prevention. However, the accumulation of SARS-CoV-2 mutations and their rapid spread in the population have led to the emergence of mutant strains that evade host immune responses. The current SARS-CoV-2 vaccine may not be able to effectively control the spread of mutant strains, so the research and development of vaccines and drugs for the prevention and treatment of mutant strains will continue. Rodents are crucial to the study of virus etiology, transmission and pathogenesis, and have played an important role in the early development of related inactivated vaccines and antibodies.This review mainly summarizes the research progress of rodent models in SARS-CoV-2 Alpha, Beta, Gamma, Delta, Omicron mutants.

Objective To evaluate the effectiveness and safety of moxibustion for knee osteoarthritis and the methodological quality of systematic reviews(SRs).Methods SRs of moxibustion for knee osteoarthritis were retrieved from CNKI,VIP,Wanfang Data,SinoMed,PubMed,Cochrane Library,Embase and Web of Science was conducted from the establishment of the databases to February 10,2022.AMSTAR 2 was used to assess the methodological quality of SRs.The randomized controlled trials(RCTs)included in these SRs were screened and summarized according to inclusion standard.RevMan 5.4 software was used for Meta-analysis,and GRADE approach was used to assess the certainty of evidence.Results A total of 15 SRs were included.The evaluation results of the AMSTAR 2 showed that the methodological quality was very low for 14 SRs,and low for other 1 SR.A total of 36 RCTs were included.Meta-analysis results showed that compared with the non-steroidal anti-inflammatory drugs(NSAIDs),the moxibustion group had better effects on improvement of WOMAC scores[mean difference(MD)=-5.95;95%confidence interval(CI):-9.25 to-2.65;low quality],relieving pain[MD=-1.26;95%CI:-2.19 to-0.32;very low quality],and improving effective rate[risk ratio(RR)=1.16;95%CI:1.11 to 1.22;low quality].In the moxibustion group,some patients experienced blisters,and most healed in 3 days.Conclusion Moxibustion has advantages in pain reduction and improving effective rate compared with routine Western therapy for knee osteoarthritis.However,well-designed high-quality RCTs are needed for further verification.

Objective:To understand the epidemiological characteristics and spatiotemporal distribution of viral encephalitis in children and adolescents in Henan Province from 2012 to 2023.Methods:The information about viral encephalitis cases from October 1, 2012 to July 26, 2023 were collected from Zhengzhou Children's Hospital (National Children's Regional Medical Center),Henan Provincial Children's Hospital for the analyses on temporal distribution the cases, the severe illness rate, age distribution, pathogen type and imaging findings of the cases.Results:A total of 6 276 cases of viral encephalitis were included in this study after excluding cases with incomplete information. The cases mainly originated from Zhengzhou (38.96%), followed by Zhoukou (9.93%), Xuchang (8.68%), Zhumadian (7.90%) and Pingdingshan (7.39%). The cases in boys accounted for 62.13% and the cases in girls accounted for 37.87%. Most cases (72.45%) occurred in age group 7-13 years. The overall rate of severe illness cases was 4.51% from 2012 to 2023. There were significant differences in severe illness cases among different areas and years ( χ2=5.33, P=0.021; χ2=48.14, P<0.001). Enteroviruses were mainly detected (31.57%), in which Coxsackie virus was predominant (58.37%). Imaging findings showed that cerebral hemisphere damage was most common in children and adolescents with viral encephalitis (54.93%). Conclusions:From 2012 to 2023, more cases of viral encephalitis occurred in boys in Henan. Children and adolescents aged 7-13 years were the main affected group. The prevention of enteroviruses infection, especially Coxsackie virus, needs to be strengthened. Special attention should be paid to the prevention of cerebral hemisphere damage after viral encephalitis diagnosis.

Berberine is a commonly used traditional Chinese medicine,which has the antimicrobial and anti-inflammatory properties.Ongoing investigations have identified berberine as an effective medicine for systemic diseases,such as cardiovascular diseases,diabe-tes mellitus and neurological disorders.At the same time,there exists a close relationship between oral microbiota and these systemic diseases.This review focuses on the relationship between berberine,oral microbiota and systemic diseases,offering new insights for the treatment of systemic diseases.

The fundamental pathogenic mechanisms of inflammatory bowel disease(IBD),a chronic inflammatory illness affecting the gastrointestinal tract,are still not fully understood.Dipeptidyl peptidase Ⅳ(DPP-4)is a glycoprotein found on the cell surface that has signaling and enzymatic properties.In addition,there is growing evidence from animal models and clinical trials that DPP-4 inhibitors have potential impacts beyond only lowering blood sugar levels,such as immunomodulatory and anti-inflammatory capabilities.This article reviews the biological properties of DPP-4 and its research progress in the diagnosis and treatment of IBD.It also discusses the mechanism of DPP-4 in IBD,aiming to provide a more in-depth understanding of the role of DPP-4 in IBD.

Syndrome differentiation and treatment is a unique mode of diagnosis in traditional Chinese medicine （TCM）. The establishment of scientific and standardized syndrome diagnosis standards is an important link to evaluate the clinical efficacy of TCM objectively and systematically， and also a prerequisite for the promotion and development of TCM to obtain international recognition. This article reviewed the basic modes and existed problems of the current syndrome diagnosis criteria， and proposed to construct a multidimensional core information set integrating the minimized core symptoms， the artificial intelligence signs， the multi-modal laboratory indicators， and multi-omics specific markers， so as to present syndrome characteristics from multiple perspectives systematically. This paper also described the basic mode， constructure， as well as the process and methodology to be adopted in the establishment of the standardized diagnostic research method. The core information set of diagnostic symptoms not only took into account the specificity of the disease， but also improved the inconsistency due to the complexity and subjectivity of the syndrome differentiation， thereby providing a methodological basis for the standardization of TCM syndrome differentiation in clinical research.

Objective: To explore the effect of ultrasound on dentin smear layer's surface and bonding strength of the universal resin adhesive under self-etching mode. Methods: Forty mandibular third molars without caries were randomly divided into two groups; one was polished with silicon carbide sandpaper; the other was polished with silicon carbide sandpaper followed by ultrasonic treatment. Scanning electron microscope (SEM) was used to observe surface of the dentin. Treated teeth were bonded with two universal resin adhesives, Clearfil Universal Bond (pH=2.3) and All-Bond Universal (pH=3.1), and the penetration of the bonding interface was observed with a confocal laser scanning microscope (CLSM) after Rhodamine B staining. Finally, the micro tensile bond strength test was conducted to test the adhesion. Results: The SEM showed that after polishing with silicon carbide sandpaper, the smear layer of the dentin surface was scratched, and dentin tubules were almost completely blocked, with no obvious dentin tubules exposed. After ultrasonic treatment, the scratches were reduced, and a large number of dentin tubules were exposed. CLSM showed that both adhesives could penetrate the dentin along the dentin tubules more deeply after ultrasound treatment. Micro tensile bond strength tests showed that ultrasonic treatment could enhance the bonding strength of two universal resin adhesives. However, there was no statistical difference in bonding strength between these two universal resin adhesives under the same treatment. . Conclusion Ultrasound can partially remove the smear layer on dentin's surface, expose dentin tubules, and increase universal resin adhesives' penetration depth and bonding strength under self-etching mode

Objective:To establish a rat model of diabetic microangiopathopathy and simulate the biochemical and pathological changes of diabetic retinal and renal microangiopathopathy.Methods:Forty healthy male Sprague-Dawley rats were randomly divided into blank group and model group (10 and 30 rats, respectively). After the rats in blank group and model group were fed ordinary diet and high-fat and high-sugar diet for 5 weeks, respectively, the rats in model group were injected with 1% streptozotocin (STZ) through the abdominal cavity at the dose of 35 mg/kg to establish a type 2 diabetes model. After modeling, the rats were continuously fed until the 10th week (4 weeks after modeling), the general conditions of the rats were observed, and samples were collected for follow-up experiments. Serum creatinine (CREA), triglyceride (TG), total cholesterol (TC), high density lipoprotein (HDL-C), low density lipoprotein (LDL-C), microalbuminuria, urinary creatinine (UCr) and urine sugar were detected. Calculate the kidney index and microalbumin/urinary creatinine ratio (UACR). Optical coherence tomography angiography (OCTA) was used to observe the vascular changes and non-perfusion area of retinal superficial capillary plexus. The morphological and structural changes of kidney and retina were observed by hematoxylin-eosin and periodate Scheff staining. The expression of nerve fibers and nucleus of Müller cells in rat retina was observed by immunofluorescence staining. Ultrastructural results of retina were observed by transmission electron microscope. Independent sample t test was used for comparison between groups. Results:Four weeks after modeling, compared with blank group, the body weight of rats in model group was significantly decreased, and random glucose was significantly increased, with statistical significance ( t=5.755, -51.291; P<0.05). Renal index, urinary glucose and UACR were significantly increased, while UCr was significantly decreased, with statistical significance ( t=10.878, 137.273, 3.482,-6.110; P<0.05). CREA decreased, TG, TC, HDL-C, LDL-C increased, and the differences were statistically significant ( t=-28.012, 33.018, 118.018, 13.585, 16.480; P<0.05). OCTA examination showed that there was no perfusion area of shallow retinal capillaries. The optical microscope showed that the inner boundary membrane of retina in model group was swollen and thickened, the surface was uneven, the inner and outer nuclear layer cells were disordered and the density decreased. Glomerular congestion was accompanied by cortical tubular epithelial swelling, widening of the mesangial area, and thickening of the basement membrane. The results of immunostaining showed that the inner and outer plexiform layers of the retina showed lamellar strong green fluorescence expression, and the inner and outer nuclear layers showed scattered dot green fluorescence expression. Transmission electron microscopy showed that the basal membrane of retinal microvessels in model group was slightly thickened, vascular endothelial cells edema, endothelial nucleus and perinucleus contraction, nuclear membrane contraction, mild mitochondrial swelling, vacuolation. Conclusion:High-glucose and high-fat feeding plus a single intraperitoneal injection of STZ 35 mg/kg can successfully establish a microangiopathic model of type 2 diabetes.

ObjectiveTo explore the oral health status and oral health knowledge of women who are preparing for pregnancy in Shanghai so as to provide information on oral health. MethodsThe quota sampling method was adopted for 203 women preparing for pregnancy selected as the survey subjects in December 2019. Their oral health status was checked through oral examinations， and their awareness of oral health knowledge was investigated through questionnaire surveys. ResultsOral examination showed that in 203 women， the caries rate was 70.44%， the periodontal health rate was 4.43%， the dental calculus detection rate was 83.25%， the gingival bleeding detection rate was 59.61%， the shallow periodontal pocket rate was 9.85%， the deep periodontal pocket rate was 0.99%， and the detection rate of impacted teeth was 45.45%. The rate of women who answered all the questions in the questionnaire correctly was 0. ConclusionThe oral health of women preparing for pregnancy needs to be improved， and the level of oral health awareness needs to be raised urgently. The research results will help formulate and implement standardized oral health promotion policies.

Objective:To investigate the feasibility, effectiveness and safety of indocyanine green (ICG) navigation in the surgical resection of abdominal wall endometriosis (AWE).Methods:Seven women undergoing surgery for AWE in First Affiliated Hospital of Sun Yat-sen University (from July 1, 2021 to October 1, 2021) were collected. After exposure of the focus, ICG were used intravenously (0.25 mg/kg) as fluorescent dye for the intraoperative evaluation of AWE vascularization. Resection of the AWE was guided by direct visualization of the focus under standard laparoscopy with a near-infrared (NIR) camera head. Surgical margin around the AWE (3, 6, 9 and 12 point) and the margin under the focus were obtained for postoperative pathological examination of endometriosis. Time from injection to fluorescence visualization, the proportion of fluorescence visualization, time of fully resection of AWE, side effects related to the use of ICG, perioperative complications as well as the pathological result of the surgical margins were recorded.Results:ICG fluorescence of the AWE were seen in 5 patients (5/7). The mean time from injection to fluorescence visualization was (46.7±9.8) s. The mean time of fully resection of AWE was (16.4±7.0) minutes. There were no side effects related to the use of ICG. The rate of class-A wound healing was 7/7. All of the surgical margins were confirmed endometriosis-negative by postoperative pathological examination.Conclusion:ICG fluorescence visualization could conduct accurate resection of AWE, which is clinically safe and effective.