BACKGROUND: The incidence of deep venous thrombosis of the lower extremity after spinal surgery remains controversial, and its prevention is still under discussion.OBJECTIVE: To summarize the progress of the prevention of the deep venous thrombosis after spinal surgery.METHODS: The domestic and foreign related literature about the deep vein thrombosis after the spinal surgery, which was filtrated from CNKI and PubMed databases, were searched for the articles concerning the prevention of the deep venous thrombosis after spinal surgery published from January 1993 to January 2016.Finally, 41 eligible articles were included, and the prevention methods, risk factors and incidence were summarized.RESULTS AND CONCLUSION: (1) With the technology and medical equipment development, more novel technologies and biomaterials are extensively applied in spinal surgery; meanwhile, complex and difficult surgeries,big surgical trauma and prolonged operation time all increase the risk of deep venous thrombosis of the lower extremity;thereafter, the incidence is on a rise. (2) The prevention methods of deep venous thrombosis have been improved, and the grading of prevention becomes more sufficient. (3) During venipuncture and injection, upper extremity should be selected firstly, so as to avoid damage to the lower extremity veins. (4) The following studies should concentrate on understanding the epidemic characteristics of deep venous thrombosis of the lower extremity after spinal surgery, and confirming the best prevention time, as well as effective drugs and physical measurements.

Mathematical model has been increasingly applied in the description of the transmission of schistosomiasis, the prediction and selection of schistosomiasis prevention measures, and it has being developed constantly. This paper briefly introduces several typical mathematical models for transmission of schistosomiasis and summarizes their advancements.

Objective To explore the application of amplified fragment length polymorphism (AFLP) in the study of genetic diversity of Oncomelania hupensis. Methods A snail was taken at random from Dali region, Yunnan Province and Yueyang City, Hunan Province respectively, and DNA was drawn with guanidinium thiocyanate and resin et al. Genomic DNA was amplified selectively by the AFLP technique with 64 pairs of primers, and the polymorphism of PCR products was examined by SDS-PAGE. Results The number of AFLP markers was between 5 and 55 for a pair of primers. The average number of a pair of primers was 38.30 (95% CI 36.03-40.57) for the snail from Yunnan Province, and 39.14 (95% CI 36.71-41.57) for the one from Hunan Province. For a pair of primers, the number of amplified polymorphic markers was between 3 and 37, and the polymorphic rate was between 28.6% and 76.2%, the average, 23.67 (95% CI 22.12-25.22) and 47.36%(95 %CI 45.22%-49.50%), respectively. The average similarity between the two populations was 0.69 (95% CI 0.67-0.70). Conclusion The AFLP technique is a new path for classifying Oncomelania hupensis and studying the genetic diversity of it.[

Objective To analyze the concentration, distribution and decreasing trend of niclosamide in soil through soil heaping mixed with niclosamide and the effect of Oncomelania control, and to explore the appropriate dosage for the 'heaping' method. Methods The soil samples were collected from six groups in Tezi township, Puge county, Sichuan Province, and the dosages were 16, 8, 4, 2, 1 and 0 g/m~2, respectively. After ultrasonic extraction, centrifugence and concentration, the samples were finally determined by high-performance liquid chromatography (HPLC). The mortality rate of snails was observed after 3 days and 7 days. Results The standard error and range of niclosamide in soil were large. There was no significant difference in concentration of niclosamide between the surface layer and deep layer of soil (P>0.05). After 5 months, niclosamide still could be determined in groups of 4 g/m~2. The mortality rate of snails decreased as the concentration of niclosamide decreased (P<0.05). After 5 months, in the group of 4 g/m~2 dosage, the 3 and 7 days mortality rate of snails were 5.33% and 9.33% in the surface layer, higher than the control group (P<0.05). Conclusions The heaping method is an efficacious measure of controlling snails and its recommended dosage is 4 g/m~2.

ObjectiveTo investigate the dynamic changes of T helper (Th) responses and hepatic granuloma development during Schistosoma japonicum infection and to evaluate the possible correlation between the Th1/Th2 cytokines and pathological liver damage. MethodsSera from both Schistosoma japonicum infected C57BL/6 mice and uninfected controls were measured for interferongamma (IFN-γ), interleukin (IL)-4 and IL-13 at week 4, 6, 8 and 12 post-infection. At the same time, the splenic Th1/Th2 ratio was examined. The development of liver granulomas in infected mice was also observed and the correlation between the cytokines and granulomas were assessed. Wilcoxon test and Spearman rank correlation test were performed for data analysis. ResultsSerum IFN-γ level in infected mice was (2. 835±0. 049) lgpg/mL at week 4 post infection, which was significantly higher than that in controls [(1. 787 ± 0. 174) lgpg/mL, Z= - 2. 646, P = 0. 008]. Thereafter, the level declined after week 6, but remained higher than controls at the end of 12-week experiment (Z= -2.457, P=0. 014). IL-4 and IL-13 levels did not increase until week 6 (Z=-2. 646,P=0. 008;Z=-2. 646,P=0. 008), and peaked at week 8. After soluble egg antigen (SEA) stimulation, splenic Th1/Th2 ratio in infected mice was 0.5 (95％ CI 0. 2-1.2) at week 8 and 0.3 (95％ CI 0. 3-0.6)at week 12 post infection, both of which were significantly lower than those in uninfected controls (week 8: Z=2. 173, P=0.030; week 12:Z=2.551, P=0.011). Compared with unstimulated splenic cells, splenic Th1/Th2 ratio after SEA stimulation significantly decreased at week 8 (Z=2. 236, P=0. 025) and week 12 (Z=3. 130, P=0.002). Granulomas were first observed in livers at week 6 and the size kept on increasing. A negative correlation between serum IL-13 and the diameter of liver granulomas was discovered at week 12 post infection (r=0. 636, P= 0. 048). Conclusions Th1 response is dominant during the early stage of Schistosoma japonicum infection.However,followed by oviposition, Thl response declines and meanwhile a strong Th2 response gradually develops. Therefore, Th2 response probably plays a role in the development of hepatic granulomas.

OBJECTIVE: To investigate the effects of Gypsum Fibrosum and Gypsum Fibrosum Preparatum in promoting granulation. METHODS: The wounds of muscle layer were produced in rats by using surgical operation. Two round wounds, with diameter about 1.5 cm, were cut at the depilatory area of two sides of the back of each rat, with an interval of 2 cm, deep to muscle layer, and the thickness of the knife wound of muscle layer was about 0.15 cm. Forty SD rats with the wounds were randomly divided into 4 groups: untreated group, beifuji-treated group, Gypsum Fibrosum-treated group and Gypsum Fibrosum Preparatum-treated group, with 10 rats in each group. Then the wounds were sprinkled with powders of Gypsum Fibrosum and Gypsum Fibrosum Preparatum, or sprayed with beifuji solution, respectively. The healing state of granulation tissues of the wounds was observed at the eighth and fourteenth day respectively. RESULTS: The number of fibroblasts, the number of capillary tubes and the area of capillary tubes in granulation tissue of wounds in the Gypsum Fibrosum Preparatum-treated group were significantly higher than those in the untreated group and Gypsum Fibrosum-treated group (P<0.01). There were no statistical differences between the Gypsum Fibrosum Preparatum-treated group and the beifuji-treated group. However, Gypsum Fibrosum-treated group showed no obvious differences compared to the untreated group (P>0.05). CONCLUSIONS: Gypsum Fibrosum Preparatum can accelerate the formation of collagenoblast and micrangium in wounds, and the proliferation of granulation tissues, thus promoting the skin wounds to healing. The effect of Gypsum Fibrosum is changed after being calcined, and Gypsum Fibrosum Preparatum has obvious effect in promoting granulation.

Schistosomiasis is a neglected tropical disease which is socioeconomically devastating and a significant cause of morbidity in endemic countries or regions. Some countries and regions have brought down the prevalence of schistosomiasis through positive prevention and control programs. However in the past few years with the social and economic development and globalization re?emergence and spread of schistosomiasis led to a growing concern that new endemic areas may occur. This article analyzes the epidemiological situation and the strategies to control schistosomiasis in China and African countries.

The elimination of Oncomelania hupensis snails is important to schistosomiasis control. Recently,the application of molluscicidal organisms is considered as a safe and efficient method for snail elimination. In order to provide scientific evi?dences for effective control of O. hupensis and schistosomiasis,this paper summarizes the researches of molluscicidal microor?ganisms against O. hupensis.

Objective To explore the geographic pattern of morphologic variation within snail populations across the mainland of China. Methods Twenty-one snail populations from the different regions were collected, and Shannon-Winer index and Euclidean distances within populations were used to analyze the spatial distribution of morphologic variation of Oncomelania hupensis. Results Longitude correlated significantly with Shannon-Winer index and Euclidean distances within populations, and the correlation coefficients were 0.719(P

Objective To explore morphologic variations and their spatial correlation among Oncomelania hupensis populations from the mainland of China. Methods Twenty-seven snail populations from ten provinces were collected. The morphologic indices of shells and geographic distances between the snail spots were measured respectively, and the morphologic variations among snail populations and the correlations between morphologic variations and geographical distances were analyzed. Results The median of Euclidean distances was 3.24 (95% CI: 2.88-3.81) among 20 snail populations of O.h.hupensis including a snail population from Guangxi Province, and was 3.15 (95% CI: 2.86-3.76) excluding the Guangxi snail population; the median was 1.69 (95% CI: 1.33-2.27) among 6 populations of O.h.robertsoni. Whether including a snail population from Guangxi Province or not, the median among O.h.robertsoni was less than that among O.h.hupensis (P0.05). The correlation coefficient was 0.2655 for O.h.hupensis including a snail population from Guangxi Province, 0.2567 not including it; and was 0.3121 for ribbed-shell population. Conclusions Morphologic variation among O.h.hupensis is bigger than that among O.h.robertsoni, and morphologic variation among ribbed-shell populations is bigger than that among smooth-shell populations. There is significant spatial structure among ribbed-shell snail populations of Oncomelania hupensis distributed in the mainland of China.