Objective:To evaluate the long-term protective efficacy of the recombinant Chinese hamster ovary cell-derived hepatitis B vaccine（CHO-HepB）26 years post-vaccination in the rural China.Methods:Zhengding county，Hebei province was designated as a rural monitoring site for CHO-HepB efficacy. Study participants included individuals born between 1997 and 1999 who had completed the three-dose CHO-HepB primary series without booster doses. A cross-sectional survey was conducted in late 2024 using random sampling. Demographic and vaccination history data were collected via questionnaires，and hepatitis B virus（HBV）serological markers were detected using chemiluminescence. Historical surveillance data were integrated to infer infection statuses of HBsAg-positive individuals and evaluate longitudinal trends in anti-HBs seropositivity and antibody titers.Results:Among 178 participants（mean time since vaccination：26.2 years），the seroprevalence rates were 0.6% for HBsAg（95% CI：0.0%-1.6%），64.6% for anti-HBs（95% CI：57.6%-71.6%），and 1.1% for anti-HBc（95% CI：0.0%-2.7%）. Compared to the pre-vaccination baseline HBsAg positivity of 11.3% in children under 10 years of age，the estimated vaccine protection rate was 95%. Two notable cases were identified：one with concurrent HBsAg and anti-HBc positivity and one with anti-HBs and anti-HBc positivity，suggestive of transient HBV exposure（1999—2009）without chronicity. Natural immune boosting was inferred for the latter case based on anti-HBs titer dynamics. Longitudinal analysis of four prior cross-sectional surveys（2005，2009，2013，and 2017）revealed no significant upward trends in HBsAg and anti-HBc positivity（both P>0.05）over 26 years，while anti-HBs seropositivity declined significantly（ P<0.05）from 6 to 26 years post-vaccination. Conclusion:The CHO-HepB vaccine demonstrates sustained immunological persistence and robust long-term protection up to 26 years post-immunization. Continued emphasis on rigorous implementation of mother-to-child transmission prevention strategies is critical for future hepatitis B control.

Objective:To evaluate the long-term protective efficacy of the recombinant Chinese hamster ovary cell-derived hepatitis B vaccine（CHO-HepB）26 years post-vaccination in the rural China.Methods:Zhengding county，Hebei province was designated as a rural monitoring site for CHO-HepB efficacy. Study participants included individuals born between 1997 and 1999 who had completed the three-dose CHO-HepB primary series without booster doses. A cross-sectional survey was conducted in late 2024 using random sampling. Demographic and vaccination history data were collected via questionnaires，and hepatitis B virus（HBV）serological markers were detected using chemiluminescence. Historical surveillance data were integrated to infer infection statuses of HBsAg-positive individuals and evaluate longitudinal trends in anti-HBs seropositivity and antibody titers.Results:Among 178 participants（mean time since vaccination：26.2 years），the seroprevalence rates were 0.6% for HBsAg（95% CI：0.0%-1.6%），64.6% for anti-HBs（95% CI：57.6%-71.6%），and 1.1% for anti-HBc（95% CI：0.0%-2.7%）. Compared to the pre-vaccination baseline HBsAg positivity of 11.3% in children under 10 years of age，the estimated vaccine protection rate was 95%. Two notable cases were identified：one with concurrent HBsAg and anti-HBc positivity and one with anti-HBs and anti-HBc positivity，suggestive of transient HBV exposure（1999—2009）without chronicity. Natural immune boosting was inferred for the latter case based on anti-HBs titer dynamics. Longitudinal analysis of four prior cross-sectional surveys（2005，2009，2013，and 2017）revealed no significant upward trends in HBsAg and anti-HBc positivity（both P>0.05）over 26 years，while anti-HBs seropositivity declined significantly（ P<0.05）from 6 to 26 years post-vaccination. Conclusion:The CHO-HepB vaccine demonstrates sustained immunological persistence and robust long-term protection up to 26 years post-immunization. Continued emphasis on rigorous implementation of mother-to-child transmission prevention strategies is critical for future hepatitis B control.

Objective:To assess the mental health status of anesthesiology residents and identify its influencing factors during standardized training, and to enhance the attention and understanding of standardized training management personnel regarding the mental health of residents.Methods:All on-duty residents in the anesthesiology departments of ten standardized anesthesiology training bases, including The Second Affiliated Hospital of Harbin Medical University, were selected as subjects. Self-designed questionnaires were distributed, which included a general information survey, the Self-Rating Anxiety Scale (SAS), the Self-Rating Depression Scale (SDS), the Fatigue Severity Scale (FSS), and the Self-Rating Scale of Sleep (SRSS), to investigate the psychological state and sources of stress. Based on the questionnaire results, residents from the Department of Anesthesiology at The Second Affiliated Hospital of Harbin Medical University were purposively and heterogeneously selected as interviewees. One-on-one semi-structured in-depth interviews were conducted to understand the major life events that triggered emotional or psychological issues and their connections with standardized training or the profession. This survey also aimed to understand the support that anesthesiology residents hoped to receive and their suggestions for the standardized training program. The chi-square test, t-test, and one-way analysis of variance were performed using Graphpad Prism 9.0. Interview content was coded and categorized using data analysis software NVivo12. The Colaizzi's seven-step method was used to analyze the data and extract interview themes. Results:A total of 157 valid questionnaires were recovered, with a response rate of 100.00%. The mean scores of SAS, SDS, FSS, and SRSS were (50.60±14.16), (56.31±12.90), (44.49±13.88), and (27.78±9.40), respectively, all meeting the diagnostic criteria for mild conditions. Of them, 16 (10.19%), 18 (11.46%), 47 (29.94%), and 19 (12.10%) residents met the diagnostic criteria for severe conditions. Compared with Grade 1 residents, Grade 3 residents showed increased scores in anxiety [(54.24±13.83) vs. (47.02±12.04), P=0.030] and depression [(59.66±12.74) vs. (51.53±10.76), P=0.005]. In total, 24 anesthesiology residents were selected for semi-structured interview and three themes were identified: psychological stress related to the training bases, psychological stress related to personal issues, and psychological stress related to career prospects. Conclusions:The anesthesiology residents during standardized training have high prevalence of psychological disorders, which are closely related to work overload, financial stress, occupational exposure, and personal factors. Psychological counseling and crisis intervention should be regarded as integral components of standardized training management, and attention is needed in monitoring the psychological fluctuations of anesthesiology residents and helping them to complete their rotations on time.

Objective:To assess the effectiveness of a 6-month Ba Duan Jin exercise program in improving the balance of community-dwelling older adults.Methods:A two arms, parallel-group, cluster randomized controlled trial was conducted in 1 028 community residents aged 60-80 years in 40 communities in 5 provinces of China. Participants in the intervention group (20 communities, 523 people) received Ba Duan Jin exercise 5 days/week, 1 hour/day for 6 months, and three times of falls prevention health education, and the control group (20 communities, 505 people) received falls prevention health education same as the intervention group. The Berg balance scale (BBS) score was the leading outcome indicator, and the secondary outcome indicators included the length of time of standing on one foot (with eyes open and closed), standing in a tandem stance (with eyes open and closed), the closed circle test, and the timed up to test.Results:A total of 1 028 participants were included in the final analysis, including 731 women (71.11%) and 297 men (28.89%), and the age was (69.87±5.67) years. After the 3-month intervention, compared with the baseline data, the BBS score of the intervention group was significantly higher than the control group by 3.05 (95% CI: 2.23-3.88) points ( P<0.001). After the 6-month intervention, compared with the baseline data, the BBS score of the intervention group was significantly higher than the control group by 4.70 (95% CI: 4.03-5.37) points ( P<0.001). Ba Duan Jin showed significant improvement ( P<0.05) in all secondary outcomes after 6 months of exercise in the intervention group compared with the control group. Conclusions:This study showed that Ba Duan Jin exercise can improve balance in community-dwelling older adults aged 60-80. The longer the exercise time, the better the improvement.

Objective:This study aims to obtain the prevalence and features associated with Violence Against Children (VAC) in China and, thus, formulate a prevention strategy.Methods:The mortality-related data of VAC was sourced from the National Disease Surveillance Points System (DSP) during 2013-2021. We analyzed the DSP data regarding children aged 0-17 years old who died from violence. The hospital cases of VAC was sourced from the National Injury Surveillance System (NISS), 2013-2021. We analyzed the data from NISS with the parameter of "intentional injury" caused by VAC in children aged between 0-17 years. Using robust linear regression, we analyze the time trend in the proportion of violence incidence. To understand the variations in the incidence of different types of violence across genders, we apply the chi-square test and adjusted Pearson residuals.Results:The overall trend of death caused by VAC has declined; it was reduced to 0.14/100 000 in 2021 from 0.33/100 000 in 2013. In 2021, male VAC mortality (0.15/100 000) was higher than females (0.13/100 000). The proportion of VAC cases to all injury cases has declined from 3.34% in 2013 to 2.29% in 2021. Among 9 344 VAC cases supervised by hospitals in 2021, the number of males (7 503 cases) was around 4 times that of females (1 841 cases), and the top three modes of violence were blunt tools (64.77%), falls (7.46%) and sharp instruments (6.18%), and 45 cases of sexual violence included 38 girls and 7 boys.Conclusions:The declining death rate due to VAC may be related to the benign development of Chinese society. Prevention strategies targeting training in parenting skills and problem-solving should be prioritized.

BACKGROUND:Sema3A is a power secretory osteoprotective factor.However,studies about Sema3A-modified dental pulp stem cells(Sema3A-DPSCs)are rare. OBJECTIVE:To explore the osteogenic differentiation ability of Sema3A-DPSCs and their regulatory effect on the osteogenic differentiation of the pre-osteoblast cell line MC3T3-E1. METHODS:First,Sema3A-DPSCs were constructed using a lentivirus infection system carrying the Sema3A gene.Control lentivirus-treated DPSCs(Vector-DPSCs)were used as controls.Sema3A-DPSCs or Vector-DPSCs were co-cultured with proosteoblast line MC3T3-E1 at the ratio of 1∶1 and 1∶3 for 24 hours.Finally,the Sema3A-DPSCs,Vector-DPSCs and their co-cultured cells with MC3T3-E1 were cultured for osteogenic induction and differentiation.Osteogenic gene expression was detected by alkaline phosphatase staining,alizarin red staining and real-time quantitative RT-PCR to evaluate osteogenic differentiation ability. RESULTS AND CONCLUSION:(1)Sema3A mRNA and protein expression levels in Sema3A-DPSCs were significantly up-regulated.The level of secreted Sema3A in cell supernatant was up-regulated.(2)Compared with the Vector-DPSCs,mRNA expressions of osteogenic genes alkaline phosphatase,Runt-related transcription factor 2,osteocalcin and Sp7 transcription factors in Sema3A-DPSCs were up-regulated;the activity of alkaline phosphatase was enhanced,and the formation of mineralized nodules increased.(3)There were no obvious differences in proliferation between Sema3A-DPSCs and Vector-DPSCs.(4)Compared with MC3T3-E1/Vector-DPSCs co-culture system,the expression of MC3T3-E1 osteogenic genes was up-regulated,and the total alkaline phosphatase activity was enhanced and more mineralized nodules were formed in the MC3T3-E1/Sema3A-DPSCs co-culture system.(5)The results suggest that overexpression of Sema3A can enhance the osteogenic differentiation of DPSCs.Overexpression of Sema3A in DPSCs can promote osteogenic differentiation of MC3T3-E1 in the DPSCs/MC3T3-E1 co-culture system.

Objective: To analyze the characteristics distribution of falls among students aged 6-17 in 2018, and to provide data support for preventing falls among students and formulating the corresponding policies. Methods: Data of falls among students aged 6-17 in China in 2018 were collected from the the National Injury Surveillance System (NISS) for analyzing its demographic characteristics, injury occurrence and clinical traits of falling. Results: In total, 42 735 cases of fall aged 6-17 were collected from the NISS in China in 2018, which accounted for 54.03% of all cases, with a sex ratio of 2.34∶1, the proportion of students aged 6-11 was the highest(53.78%). The proportion of falls from March to June was the highest(42.12%), and the peak time when falls occurred was forenoon 10:00-10:59(8.40%). School and school-related area(40.40%), home(18.96%) and public residential institution (15.35%) were the sites where falls mainly occurred. The top three activities when falls occurred were leisure activities(47.41%), sports activities(23.90%) and walking(9.77%). Bruise/scrape(54.49%), sprain/strain(21.98%) and fracture(12.69%) were the major nature of injury. The most common body parts falls involved were lower limbs(34.71%), head(29.85%) and upper limbs(25.10%). The injury of falling was mainly characterized by mild ones(83.44%). Conclusion There were more cases of falls on students aged 6-17 from the NISS in China in 2018, mainly males. The epidemiological characteristics were relatively variable, so targeted prevention program of falls should be conducted.

Objective:To understand the epidemiologic characteristics of fall in people aged 60 years and above in China from 2015 to 2018, and provide basis for the prevention of fall in old people and the development of related policies.Methods:Descriptive analysis was conducted on general information, injury occurrence information and injury clinical characteristics of fall cases in people aged 60 years and above by using the data from Chinese National Injury Surveillance System(NISS).Results:A total of 205 670 fall cases were reported to NISS from 2015 to 2018 with the male to female ratio of 1.37. Falls mainly occurred during 10:00-10:59 am (11.91%). The top three places where fall might occur were home (56.41%), road (17.24%) and public residence (14.36%). Leisure activity(37.56%), housework (24.20%) and walk (15.07%) were top three activities in which fall occurred. Bruise/scrape (42.17%), fracture (31.79%) and sprain/strain (14.62%) were the major injuries. The most common body parts involved were low limbs (31.38%), head (22.46%) and truncus(20.71%). Moderate and severe injuries accounted for 37.21% of all cases, and 22.49% of the elderly seeking medical care due to fall required hospitalization.Conclusions:The number of fall in people aged 60 years and above increased from 2015 to 2018. The elderly is a key population in the prevention and control of fall.

Objective:To investigate the incidence of injuries among children aged 0-17 years from 28 counties in six provinces.Methods:According to the earlier study on data in different local areas and the current work plan, we selected the survey objects for a general survey on child injury prevalence in the last 12 months. The subjects included guardians of children who did not attend kindergartens, children from kindergartens, and primary school grades 1-3. Children from grades 4-6 primary school, junior high school, and senior high school were also included.Results:The overall rate of injured children was 4.83%, with the incidence of injuries as 5.75% in the last 12 months before the survey. Both the rate of injured children and incidence of injuries were higher in boys than that in girls. Children whose primary caregivers were relatives, grandparents, minors, or with an education level below the primary school had a relatively higher rate of both injured children and incidence of injuries. The first cause of child injury was fall. The time of child injury was mainly from June to October, mainly at home, with the main activity as playing. The significant injuries in children were contusion and abrasion, and the main parts injured were lower limbs, upper limbs, and head. Most of the injuries were cured, and the primary treatment was outpatient and emergency treatment.Conclusions:Boys and children whose parents can not take care of are the priority population for child injury prevention and control. Targeted prevention and control measures should be implemented according to the characteristics of injuries among children of different ages.

Objective:To understand the epidemiological characteristic and influencing factors of animal injuries among children from 28 counties/districts in 6 provinces of China to provide evidence for formulating related prevention measures and strategies.Methods:Data was obtained from 'Children injury prevention project, 2016-2020'. Variables on the characteristics, including incidence, locations, related activities, time, and outcomes among children, were described. The negative binomial regression model analyzed animal injury frequency influencing factors.Results:There were 107 029 boys and 97 599 girls, with a gender ratio of 1.10, among the 204 628 children aged 0-17 in 28 counties/districts in 6 provinces of China. Per-person and per-time incidence rates of animal injuries were 0.70% and 0.72%, both higher in boys than in girls. Animal injuries among children mainly occurred in home (73.20%), road/street (7.51%), and open space of community/village (6.77%), during playing (63.15%), with the peak time between 12:01-18:00 (45.03%). Upper limbs (47.89%), lower limbs (35.31%), and head (8.44%) were the most injured body parts. Outpatient or emergency treatment (85.19%) had been carried out. The negative binomial regression showed that sex, grade, guardian educational level, urban or rural, and daily communication between guardians and children as influencing factors in the frequency of animal injuries among children.Conclusions:Special attention should be given to boys, at home, in projects on animal injury prevention and control. There were many influencing factors of animal injury frequency. Knowledge of injury prevention should be popularized to children and guardians. Related comprehensive intervention should be developed in families, schools, and social settings.