Objective To develop a one-step PCR assay for rapid discrimination of six Brucella species and some intraspecific biovars.Methods Using 6 pairs of primers in one-step PCR to differentiate six classical Brucella species and some biovar in ordinary PCR instrument.The tested strains including 27 reference strains of six Brucella species and 239 Brucella strains were estimated by the PCR assay and biological identification methods.Results The six Brucella species could be precisely differentiated by the onestep PCR assay from the tested strains.Five biovars and vaccine strain of B.suis species could be determined,and biovars 1,3,4 and biovars 2,5,6,7,9 of B.abortus species could be identified at the level of their biovar,moreover,biovars 1,2 and 3,and vaccine strain Rev 1 of B.melitensis species were also discriminated at the biovar and strain level.The accurate rates of the biological identification method and the PCR assay were 98.33％ and 100％ respectively.Conclusion One-step PCR assay was a rapid,specific,and low cost method for identification of Brucella species and discriminating biovars in ordinary PCR instrument.

Objective To study the effects of social isolation (SI)on the spatial and nonspatial cognitive ability in mice.Methods The postnatal 21 day kunming mice were divided into control group,SI 2 weeks group,SI 4 weeks group,SI 8 weeks group and SI 2 weeks gregarious group according to randomized block design,with ten animals each.SI 2 weeks group,SI 4 weeks group and SI 8 weeks group were isolated for 2,4 and 8 weeks respectively,SI 2 weeks gregarious group would be housed under normal grouped housing condition after 2 weeks isolation until adult,the relative control groups were the same age as the relative SI and SI gregarious group.All animals were measured the spatial and nonspatial cognitive ability by carrying the object recognition test(ORT) and object location test (OLT) after the treatment.Results In the ORT,compared to the relative control group,the discrimination index in the SI 2 weeks group,SI 4 weeks group and SI 8 weeks group ( ( - 0.03 ± 0.003 ),( - 0.11 ±0.02) and( - 0.21 ± 0.02 ) respectively) were strikingly lower than the relative control group ( ( 0.29 ± 0.03 ),(0.13±0.07) and (0.09 ±0.03) respectively) (P＜0.05).In the OLT,compared to the relative control group,the discrimination index in the SI 2 weeks group,SI 4 weeks group and SI 8 weeks group( ( -0.15 ±0.02),( -0.30± 0.02),( - 0.32 ± 0.02 ) respectively ) were strikingly lower than the relative control group ( (0.33 ± 0.02 ),(0.41 ± 0.03 ),(0.27 ± 0.04)respectively)(P＜ 0.05 ),while the SI 2 weeks gregarious group with the resocialization to the normal housing condition showed no change.Conclusions 2 weeks,4 weeks and 8 weeks isolation on mice lead to the spatial and nonspatial cognition deficits,while the resocialization to the normal housing condition could recover the damage.

Objective:To explore the effect of continuous large-volume hemofiltration combined with somatostatin on the prognosis of patients with acute severe pancreatitis.Methods:A total of 106 patients with acute severe pancreatitis who were treated in the People′s Hospital of Xinjiang Uygur Autonomous Region from October 2019 to October 2021 were enrolled retrospectively and they were divided into drug group (53 cases) and filtration group (53 cases) according to different treatment methods. The patients in the drug group were given somatostatin instillation on the basis of routine treatment, and the patients in the filtration group were given continuous large-volume hemofiltration therapy on the basis of the drug group. The serum amylase level, clinical efficacy, clinical indicators and prognosis were compared between the two groups.Results:After treatment for 3 d and 1 week, the levels of serum amylase in the drug group were lower than those in the filtration group: (385.62 ± 15.57) U/L vs.(426.83 ± 18.21) U/L, (110.75 ± 7.68) U/L vs. (162.74 ± 9.12) U/L, there were statistical differences ( P<0.05). The total effective rate in the filtration group was higher than that in the drug group: 90.57%(48/53) vs. 75.47%(40/53), χ2 = 4.28, P<0.05. The hospitalization time, gastrointestinal decompression time and recovery time of bowel sounds in the filtration group were shorter than those in the drug group: (17.21 ± 4.01) d vs. (20.56 ± 4.57) d, (5.46 ± 1.56) d vs. (7.98 ± 1.79) d, (5.43 ± 2.11) d vs. (6.78 ± 2.54) d, there were statistical differences ( P<0.05). After treatment for 3 d and 1 week, the scores of gastrointestinal function and acute physiology and chronic health assessment (APACHE) Ⅱ in the filtration group were lower than those in the drug group: after treatment for 3 d: (1.64 ± 0.35) scores vs. (1.89 ± 0.41) scores, (23.42 ± 2.71) scores vs. (27.62 ± 3.01) scores; after treatment for 1 week: (0.67 ± 0.21) scores vs. (1.01 ± 0.32) scores, (9.78 ± 1.21) scores vs. (15.62 ± 1.58) scores, there were statistical differences ( P<0.05). After treatment for 28 d, the fatality rate in the filtration group was lower than that in the drug group: 5.66%(3/53) vs. 20.75%(11/53), χ2 = 5.27, P<0.05. Conclusions:Bedside continuous bulk hemofiltration with somatostatin in the treatment of severe acute pancreatitis can effectively reduce the serum amylase level, promote the recovery of gastrointestinal function, improve the clinical symptoms and prognosis.

Objective To investigate the prevalence and related factors of musculoskeletal diseases in nurses by means of qualitative and quantitative research, and to have a discussion on the inner experiences of nurses. Methods 1 012 clinical nurses, from one hospital during March 2019 to May 2019, were selected as research objects by convenience sampling method. The Nordic musculoskeletal disease questionnaire was used for investigation,and SPSS 21.0 was used for statistical analysis. In the qualitative study,5 ICU nurses were selected by objective sampling method. Data were collected by semi-structured interview method,and analyzed by content analysis method. Results The annual prevalence rate of musculoskeletal diseases in clinical nurses was mainly in the neck (53.2%, 538/1 012), followed by the waist and back (48.5%, 491/1 012), hip and leg (45.2%, 457/1 012). Logistic regression analysis of neck related factors showed that BMI (P=0.039), repeated operation for one minute (P=0.007), and staff shortage in the Department (P=0.027) were the influencing factors of musculoskeletal diseases. Qualitative research extracted the following two themes:negative psychological experience of nurses under high workload and positive psychological experience of nurses. Conclusion The prevalence of neck is the highest among those of other musculoskeletal diseases in clinical nurses, which is related to many related factors. In the professional environment of nurses, nurses have high self-protection willingness and ability. It is suggested to strengthen support from hospital, family and other aspects, reduce the prevalence rate, and improve the quality of work and family life of nurses.

Objective To systematically review the influencing factors of non-specific low-back pain among nurses in China. Methods The formal and published articles were retrieved based on the search terms of nurses, low-back pain and factors in Chinese National Knowledge Infrastructure (CNKI), WanFang data, VIP, China Biology Medicine Database, PubMed, Web of Science and Cochrane Library, and with the methods of "snowball" and manual searching from 31st January 2004 to 30th April 2019. RevMan 5.3 was used to meta-analysis for included articles. Results This systematic review and Meta-analysis totally included 11 articles involving 11 097 nurses, and extracted 7 influencing factors of low-back pain with OR value ＞1. There were three factors related to low-back pain including advanced working ages (OR=2.09, 95% CI: 1.55-2.82), being married (OR=1.67, 95% CI: 1.11-2.50) and being on night shift in turn (OR=1.29, 95% CI: 1.14-1.46). There still lacked strong evidences in whether ages, positional titles, education levels and departments influenced low-back pain of nurses. Conclusions Main influencing factors of non-specific low-back pain among nurses in China are advanced working ages, being married and being on night shift in turn. There are no statistical differences in the influences of ages, positional titles, education levels and departments on low-back pain of nurses. Intervention should be conducted from aspects of nurses and hospital management.

Objective:To evaluate the MAPO index of work-related musculoskeletal disorders (WMSDs) among ward nurses who manually handled patients, and to explore the influencing factors of WMSDs in the workplace.Methods:From March to May 2019, convenience sampling method was used to select 317 nurses from 26 wards of a ClassⅢ Grade A hospital. The General Information Questionnaire, MAPO index assessment, and the meter ruler were used to comprehensively evaluate the situation of WMSDs in the workplace of nurses who manually handled patients inwards with the method of on-site investigation and measurement. According to the score of the MAPO index, there were 3 risk levels of wards, namely red light, yellow light, and green light. The yellow light meant that it was necessary to implement the medium-term and long-term intervention plan, and the red light meant that the short-term intervention plan must be implemented. Multivariate Logistic regression was used to analyze the influencing factors of WMSDs in nurses who manually handled patients in the ward.Results:A total of 317 questionnaires were distributed and 265 valid questionnaires were returned with an effective response rate of 83.6%. In the 265 ward nurses, there were 76.2% (202/265) of nurses with WMSDs. There were 13 (50.0%, 13/26) wards with red lights, including 158 (59.6%, 158/265) nurses, and 6 (23.1%, 6/26) wards with yellow lights, including 92 (34.7%, 92/265) nurses, and 7 (26.9%, 7/26) wards with green lights, including 15 (5.7%, 15/265) nurses. Multivariate Logistic regression analysis showed that MAPO index and the ward score were the influencing factors for the occurrence of WMSDs among ward nurses with statistical differences ( OR=1.056, 1.571; P<0.05) . Conclusions:The risk of WMSDs in the workplace of ward nurses is high. It is recommended starting with the types of beds, bed spacing, auxiliary equipment, nursing human resource allocation, and occupational protection training to reduce the occurrence of WMSDs in nurses.

Objective:To explore the effects of Baduanjin combined with resistance exercise in rural elderly.Methods:From May to September 2020, totally 80 aged people from 2 villages in Hebei province were selected by convenient sampling. Patients from one village were randomly included into an intervention group ( n=40) , and patients from the other village were included into a control group ( n=40) . Patients in the control group took daily activities and exercise, and received only health education, while patients in the intervention group practiced Baduanjin combined with resistance exercise in addition to daily activities. The Chinese version of Fried Frailty Phenotype Assessment Components, Time Up and Go Test (TUGT) , Five-Times Sit-to-Stand Test (FTSST) , and Pittsburgh Sleep Quality Index (PSQI) were used to evaluate the frailty, balance ability, lower limb muscle strength, and sleep quality of the two groups of rural elderly before and after the intervention. In this study, totally 80 questionnaires were distributed, and 78 valid questionnaires were recovered, accounting for an effective recovery rate of 97.5%. Results:The Chinese version of Fried Frailty Phenotype Assessment Components and PSQI scores of the rural elderly in the intervention group after the intervention were lower than those in the control group and before the intervention, and the differences were statistically significant ( P<0.05) . The TUGT and FTSST time of the rural elderly in the intervention group after the intervention were shorter than those in the control group and before the intervention, and the differences were statistically significant ( P<0.01) . Conclusions:Baduanjin combined with resistance exercise can delay the debilitating state of rural elderly, improve their lower limb muscle strength, balance ability and sleep quality, and enrich their exercise methods.

Objective:To construct an Omaha system-based remote intervention program for clinical nurses' neck, shoulder and low back pain and evaluate its effect.Methods:From July to October 2020, 94 nurses with neck, shoulder and low back pain in a Class Ⅲ hospital were randomly selected by ward. Using the envelope method, nurses were randomly divided into the intervention group and the control group, with 47 cases in each group, among them, the intervention group dropped 1 and the remaining 46 persons, the control group dropped 4 and the remaining 43 persons. The intervention group conducted a remote intervention program (using Omaha system as the theoretical framework, and using literature review, semi-structured interviews and expert consultation to construct a remote intervention program for clinical nurses' neck, shoulder and low back pain) . The control group used conventional guidance. The General Information Questionnaire, Exercise Compliance Questionnaire, Knowledge-Behavior-Symptoms (K-B-S) and Visual Analog Scale (VAS) were used to evaluate the intervention effect.Results:The exercise compliance of nurses in the intervention group was 78.26% (36/46) and that in the control group was 39.53% (17/43) , the difference was statistically significant ( P<0.01) . After 6 weeks of intervention, the nurses' cognitive and behavior scores in the intervention group were higher than those in the control group, and the difference was statistically significant ( P<0.05) . There was no statistically significant difference in the symptom score between the two groups ( P>0.05) . The VAS score and frequency of neck, shoulder and low back pain were lower than those of the control group, and the difference was statistically significant ( P<0.05) . Conclusions:Based on Omaha system, the remote intervention program for the clinical nurses' neck, shoulder and low back pain is safe, scientific and theoretical. It can improve cognition and behavior of neck, shoulder and low back pain nurses, reduce the intensity and frequency of pain, and the nurses have good compliance.

Objective:To construct a training program for the life care and caring abilities of home caregivers for the aged with cognitive impairment, so as to provide a basis for conducting training.Methods:From April to May 2021, a preliminary training program was developed through literature review and group discussion. From June to July 2021, purposive sampling was used to select 12 experts from Beijing city, Hebei and Hunan provinces to conduct two rounds of Delphi expert consultation, and finally a training program for life care and caring abilities of home caregivers for the aged with cognitive impairment was constructed.Results:The effective recovery rate of the questionnaire from two rounds of expert consultation was 100.00% (12/12). The authority coefficient of 12 experts was 0.891. The Kendall's W of the first, second, and third level indicators in the second round of consultation were 0.417, 0.205 and 0.200 respectively ( P<0.05). After the second round of consultation, the average value of each item's importance assignment was > 3.500, and the coefficient of variation was < 0.250. The final training program for the life care and caring abilities of home caregivers for the aged with cognitive impairment included 4 training modules, 11 training items, and 35 training content. Training forms included PPT teaching, video learning, case analysis, role playing, operational demonstrations, practical exercises, caregiver self-sharing, and other forms. Conclusions:The training program for life care and caring abilities of home caregivers for the aged with cognitive impairment has good scientific and practical significance, and can provide a basis for the training of home caregivers for the aged with cognitive impairment.

BackgroundSibling relationships play a critical role in shaping anxiety symptoms in firstborn children. Anxiety symptoms often originate in early childhood and can persist into adolescence and adulthood. However， there is insufficient research on anxiety symptoms in preschool children， especially firstborn preschool children. ObjectiveTo explore the influencing factors of anxiety symptoms among firstborn preschool children， so as to provide references for the intervention of anxiety symptom for children in families with multiple children. MethodsFrom October to December 2021， a total of 8 449 children from 234 kindergartens in Longhua District of Shenzhen were included using a cluster sampling method. Sibling Inventory of Behavior （SIB） and Spence Preschool Anxiety Scale （SPAS） were used to investigate. Logistic regression analysis was used to identify influencing factors of anxiety symptoms in firstborn preschool children. ResultsA total of 8 419 （99.64%） valid questionnaires were collected. Anxiety symptoms were detected in 344（4.09%） firstborn preschool children. Statistically significant differences were observed between anxiety group and non-anxiety group in terms of household registration， monthly family income， maternal age， maternal education level， paternal education level， family living conditions and whether they are left-behind children （χ²/t=9.906， 33.490， 5.136， 13.485， 9.690， 17.332， 21.975， P<0.05 or 0.01）. Compared with non-anxiety group， children in the anxiety group scored higher on the SIB dimensions of rivalry， aggression and avoidance （t=165.322， 74.471， 286.419， P<0.01）， and lower on companionship， empathy and teaching （t=59.133， 42.417， 39.112， P<0.01）. Risk factors for anxiety symptoms in firstborn preschool children included left-behind children， as well as negative sibling relationships characterized by rivalry and avoidance （OR=1.195， 1.143， 1.260， P<0.05 or 0.01）. ConclusionFirstborn preschool children who are left-behind are more susceptible to anxiety symptoms. Negative sibling relationships， characterized by competition and avoidance， may also contribute to the emergence of anxiety symptoms in firstborn preschool children.