ABSTRACT
Objective To grasp the distribution status of Oncomelania hupensis snails in Poyang Lake area,so as to provide the evidence for formulating and adjusting the schistosomiasis prevention and control strategy in lake areas. Methods The vec-tor grid was created and sampled randomly by 200 m × 200 m in the spatial database of grassland,and the distribution of snails was investigated in the selected grid by using the method of mechanical sampling by 50 m × 50 m. At the same time,the eleva-tion of investigation points was extracted based on the topographic map of Poyang Lake. Results Totally 949 and 210 investiga-tion points were collected from the south and north of Poyang Lake areas,accounting for 3.04%and 3.21%of all the investiga-tion points in the respective region. The number of investigation points,the appearance rate of snail frame,and the average den-sity of alive snails were 15231,8.15%,and 0.463/0.1 m2,respectively. The elevation of snail distribution area of the south and north Poyang Lake areas were 11-16 m and 9-16 m respectively. The elevation of concentrated snail belts of the south Poyang Lake area were 12-13 m and 15-16 m,and the elevation of concentrated snail belts of the north Poyang Lake area was 12-14 m. Conclusions The distribution of snails is in the range of 9-16 m. The suitable habitats of snail breeding are moving from the south Poyang Lake area to the north Poyang Lake area,and from high elevation to low elevation. In the future,the schistosomia-sis prevention and control measures could be formulated based on the geographical characteristics of current snail distribution in order to consolidate the achievements of schistosomiasis control.
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Objective To analyze the status and trends of soil-transmitted nematode infections in Jiangxi Province from 1989 to 2014,so as to provide the evidence for generating the strategy of soil-transmitted nematode prevention and control. Methods The data of three epidemiological surveys on human parasitic diseases(in 1989,2002 and 2014)were classified and analyzed. The stool examination by Kato-Katz's thick smear method was adopted for the investigation of soil-transmitted nematode infec-tions. Results The total infection rate of soil-transmitted nematodes decreased by 91.89％from 77.67％in 1989 to 6.30％in 2014,in which the infection rate of Ascaris lumbricoides decreased by 98.78％from 71.11％to 0.87％,the infection rate of Trich-uris trichiura decreased by 96.80％from 29.67％to 0.95％,and the infection rate of hookworm declined by 73.57％from 17.63％to 4.66％. The infection rates of soil-transmitted nematodes in the female were higher than those in the male in three surveys. In different ecological districts,the infection rates of soil-transmitted nematodes in the female were also higher than those in the male,except in Zhe-Min Ecological District in 2002 and 2014. A declined trend of the infection was showed in all age-groups in the three surveys,but it slowed down by the growth of age,i.e.,the reduction rate was 97.03％in the age group of<10 years while 80.62％in the age group of>70 years. In 2014,the number of persons infected with soil-transmitted nematodes occupied 65.4％of the whole number of persons infected with intestinal parasites. Conclusions The mean infection rates of soil-transmit-ted nematodes decrease obviously in human population in different ecological districts,but the soil-transmitted nematodes are still the main species in intestinal parasite infections. The sequence of dominant species changes from A. lumbricoides,hook-worm and T. trichiura in 1989 to hookworm,T. trichiura and A. lumbricoides in 2014. The rural female and elder people are the key population,while hookworm is the key species for the prevention and control of soil-transmitted nematodes.
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Objective·To investigate the relationship between quantitative indices of carotid plaques from contrast-enhanced ultrasound and leukocytes, and explore the value in the patients with acute large artery atherosclerotic stroke (LAAS). Methods·A total of 62 patients with LAAS and 48 matched control subjects hospitalized in Shanghai General Hospital, Shanghai Jiao Tong University from June 2016 to June 2017 were enrolled. Obvious carotid plaques were examined by contrast-enhanced ultrasound. The parameters of time-intensity curve i.e. peak (PTIC) and mean (MTIC), and the parameters of fitting curve i.e. peak (PFC), sharpness (SFC), and under the curve area (AUCFC) were obtained. These parameters were compared between the groups using two samples t tests. The correlations between the parameters and leukocyte counts were analyzed by Pearson correlation analysis. Results·① In LAAS group, the total leukocyte and neutrophil counts were higher than those of the control group, while the lymphocyte count was lower than that of the control group (P<0.05). ② The PTIC, MTIC, PFC, SFC and AUCFC were significantly larger in LAAS group than those in the control group, respectively (P<0.05).③ PTIC, MTIC and PFC were negatively correlated with lymphocytes, respectively (r=-0.291, -0.263 and -0.270, P<0.05). SFC and AUCFC were positively correlated with neutrophils, respectively (r=0.261 and 0.298, P<0.05). Conclusion·Quantitative indices of carotid plaques from contrast-enhanced ultrasound are associated with circulating leukocytes, and the association helps assess the vulnerability of the plaques.
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<p><b>OBJECTIVE</b>To study the levels and roles of cytokines TNF-α, IL-6 and IL-10 in bronchoalveolar lavage fluid (BALF) in children with Mycoplasma pneumoniae pneumonia (MPP).</p><p><b>METHODS</b>The levels of TNF-α, IL-6 and IL-10 in BALF were measured using ELISA in children with MPP at acute stage (n=45) and at remission stage (n=30). Twenty children without lung lesions severed as the control group.</p><p><b>RESULTS</b>The TNF-α, IL-6 and IL-10 levels in BALF were higher in children with MPP at acute stage than those in the control group (P<0.05). The levels of TNF-α and IL-6 in BALF at remission stage were reduced to the levels similar to the control group and were significantly lower than those at the acute stage in children with MPP. However, the levels of IL-10 in BALF remained at higher levels at remission stage in children with MPP.</p><p><b>CONCLUSIONS</b>The levels of TNF-α, IL-6 and IL-10 in BALF increase in children with MPP at acute stage, suggesting that the cytokines may be involved in the pathogenesis of MPP.</p>