Objective To understand the epidemiological and clinical characteristics of imported malaria cases admitted in Dalian and provide evidence for clinical diagnosis,treatment and control of the disease.Methods A retrospective analysis method was used to descriptively analyze the epidemiological data of 104 cases of imported malaria from 2013 to 2018 treated in Dalian Sixth People's Hospital.The clinical characteristics of 93 hospitalized patients (13 in the severe group and 80 in the non-severe group) were analyzed by t (t') test or Mann-Whitney U test.Results Among 104 cases of imported malaria,82 cases were falciparum malaria,5 cases were vivax malaria,4 cases were oval malaria,2 cases were quartan malaria,2 cases were mixed infections,and there were 9 cases without classification.The ratio of males to females was 16.33:1.00 (98:6).The age was (42.07 ± 11.07) years.There was no obvious seasonality in the onset time.We found 102 cases were come from Africa,and their main occupations were outbound workers or fishermen.After blood laboratory examination at admission between severe group and non-severe group,the differences of red blood cell (RBC),hematocrit (PCV),hemoglobin (Hb),serum creatinine (SCr),and blood urea nitrogen (BUN)were statistically significantly different (t =6.561,7.140,6.962;Z =-3.469,-3.739,P ＜ 0.05).Conclusions In Dalian the falciparum malaria is the main infectious species in imported malaria cases,and Africa is the main area of infection.Outbound workers should be trained in malaria prevention and treatment in Africa.Early admission indicators (RBC,PCV,Hb,SCr,BUN) help clinicians to diagnosis and treat severe cases early.

OBJECTIVE: To explore the influencing factors of neck work-related musculoskeletal disorders( WMSDs) and their effects in airport porters. METHODS: A total of 413 airport porters were chosen as study subjects using judgment sampling method. Chinese version of Musculoskeletal Questionnaire was used to investigate the prevalence of WMSDs.Then structural equation model was constructed and used to analyze the influencing factors of neck WMSDs. RESULTS: The prevalence of neck WMSDs in airport porters was 37. 3%( 154/413). Postural load,mental workload and length of service had a direct effect on neck WMSDs of porters( path coefficients were 0. 405,0. 166,0. 296,P < 0. 05),and mental workload also had an indirect effect on neck WMSDs through postural load( path coefficient was 0. 103,P < 0. 01).CONCLUSION: Posture load,mental workload and length of service are risk factors of neck WMSDs in airport porters.

OBJECTIVE: To investigate the correlation of mental workload and prevalence of work-related musculoskeletal disorders musculoskeletal disorders( WMSDs) in railway vehicle manufacturing workers.METHODS: A total of 362 male workers in assembling and welding workshop from a railway vehicle manufacturing enterprise were selected as study subjects by cluster sampling method.The level of mental workload and prevalence of WMSDs were investigated using a revised Subjective Workload Assessment Technique and China Musculoskeletal Questionnaire.RESULTS: The median score of mental workload was 67 and the prevalence rate of WMSDs was 56.9%.The multivariate logistic regression analysis results indicated that the higher the mental workload of railway vehicle manufacturers,the higher their risk for WMSDs after excluding the influence of confounding factors( P < 0.05).Workers in welding work showed a higher risk than those in assembling work( P < 0.01).Workers with fast work rhythm showed higher risk of WMSDs than those with regular working rhythm( P < 0.01).Workers with comfortable working environment and temperature showed lower risk of WMSDs than those with uncomfortable working environment and temperature( P < 0.01).CONCLUSION: The mental workload can increase the risk of WMSDs,with a dose-effect relationship in railway vehicle manufacturing workers.The type of work,work frequency and the temperature in working environment are also influencing factors of WMSDs.