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Progress in immunology diagnosis of food-born trematodes

Mali WU ; Anmei LI ; Wei LUO ; Zhilai GUO

Chinese Journal of Endemiology.2017;36(8):617-620. doi:10.3760/cma.j.issn.2095-4255.2017.08.018

Food-born trematodes which parasitize liver, lung and intestine cause various trematodes diseases. There are a few common trematodes such as Clonorchis sinensis, Fasciola, Opisthorchis, Paragonimus, and Echinostoma. This review provides recent progress in techniques and methods for their immunodiagnosis. These methods are mainly used to diagnose with excretory-secretary antigen, recombinant antigen and antibodies of hosts, by means of enzyme-linked immunosorbent assay, immunoblotting, immunefluorescence, immunehistochemistry, proteomics and a lateral flow detection system so on. It is beneficial to improve diagnostic and accuracy rates when all this methods are used synthetically.

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Research progress on bifidobacterium-mediated genetic engineering vaccines against parasites

Junchao SUN

Chinese Journal of Endemiology.2017;36(8):611-616. doi:10.3760/cma.j.issn.2095-4255.2017.08.017

Parasitosis is one of the most serious infectious diseases endangering human and animal health. Vaccination was an economic and effective measure in prevention and treatment of the disease. Bifidobacterium (Bb) is a kind of important probiotics in intestinal tract of human and other animals. In recent years, with the development of genetic engineering technology, Bb has been selected as a carrier delivery system to construct a series of recombinant Bb, such as in bacteria, viruses, parasites, tumor and other fields. In this review, we reported the preparation and immune effect of several kinds of Bb-mediated genetic engineering vaccines against parasites.

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The research status of rhoptry proteins vaccine of vectors mediated Toxoplasma gondii

Wengui LI ; Yatang CHEN

Chinese Journal of Endemiology.2017;36(8):606-610. doi:10.3760/cma.j.issn.2095-4255.2017.08.016

Toxoplasmosis caused by Toxoplasma gondii is one type of zoonotic, parasitic diseases seriously endangering human health. Vaccine recently becomes the highlight in control of this parasite. ROPs antigen is an effective candidate molecule of vaccine. This review outlines the status in the research of ROPs vaccine of Toxoplasma gondii mediated by bacteria such as Lactococcus lactis, Mycobacteria smegmatis, Bacille calmette-Guerin, Agrobacterium tumefaciens and Pichia Pastoris, and viruses such as Canine adenovirus type 2, Adenovirus serotype 5, Feline herpesvirus type-1 and Vaccinia virus.

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A study on the current situation of human resource and demand of pharmaceutical companies in Heilongjiang Province

Xiuwen ZHANG ; Depin CAO

Chinese Journal of Endemiology.2017;36(8):602-604. doi:10.3760/cma.j.issn.2095-4255.2017.08.014

Objective The study was focused on the current situation of human resources of pharmaceutical enterprises in Heilongjiang Province, to solve the problems of workforce shortage in small- and medium-sized pharmaceutical enterprises, and put forward corresponding countermeasures. Methods A convenient sampling method was used to investigate the basic situation of 12 pharmaceutical enterprises in Heilongjiang Province in June - November 2016, and interviews and questionnaire survey were conducted with the employees of human resources departments. The basic situation of the survey included: the general situation, the demand for talent, the development of pharmaceutical enterprises and so on. Staff interviews included: the number of talents introduced and the number of outflows in the past 3 years, human resources needs, knowledge and ability of pharmaceutical enterprises. The staff survey included: employee job satisfaction, turnover tendency and career development prospects. Results The number of employees in the 12 pharmaceutical enterprises was 22065. Employees' age was in 34 - < 44 years old, with low education qualifications, 74.6% (16456/22065) of employees attended junior college or below . There were 6246 technical personnel , most of them (3678) received college education. In the interviews with 36 employees, it was found that the pharmaceutical enterprises were short of workforce. The unstable sources for the workforce and brain drain were the biggest problem in the development of pharmaceutical enterprises. In the 591 questionnaires, 24.6%(145/591) of employees had the idea of changing jobs in the past year. Conclusion Pharmaceutical enterprises should pay attention to the introduction and training of talented staff, and develop a series of preferential conditions to attract them, so as to achieve the goal of thriving enterprises by talented workforce.

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Determination of selenium in hair by material microwave digestion-atomic fluorescence spectrometry

Yuhong CHEN ; Haihong CHEN ; Yiping WANG

Chinese Journal of Endemiology.2017;36(8):598-601. doi:10.3760/cma.j.issn.2095-4255.2017.08.013

Objective To determine the hair selenium level by material microwave digestion-atomic fluorescence spectrometry. Methods The selenium in hair was determined by hydride atomic fluorescence spectrometry after microwave digestion, and the method was improved by exploring the test conditions. The linear relationship and linear range of the standard curve, the detection limit, the precision and the accuracy of the sample determination were implemented under the optimized conditions. The selenium value of standard material of human hair was tested by material microwave digestion-atomic fluorescence spectrometry. Results The selenium detection limit of material microwave digestion-atomic fluorescence spectrometry was 0.095 μg/g, the correlation coefficient of standard curve was 0.9997, the relative standard deviation was 1.32% - 2.48%, the average recovery rate was 93.4% - 98.2%, and the selenium value of standard material of human hair was in the standard value range of uncertainty, which met the requirements. Conclusion The method is simple, accurate and precise, and it is an accurate and reliable method for determination of selenium in hair.

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A study on the determination of iodine in water by flow injection analysis without arsenic

Weidong LI ; Shudong XU ; Lisheng ZHAO ; Tingting LIU

Chinese Journal of Endemiology.2017;36(8):593-597. doi:10.3760/cma.j.issn.2095-4255.2017.08.012

Objective To establish a method for automatic determination of iodine content in drinking water by flow injection analysis (FIA) without arsenic. Methods In the dilute nitric acid solution, iodide ion in appropriate amount of nitrous acid solution could catalyze the orange red iron thiocyanate complex fade, and the use of this method combined with flow injection analysis technology formulated a flow injection method, and experimental conditions of the method were optimized. The linear relationship and linear range of the standard curve, the detection limit, the precision and the accuracy of the sample determination were implemented under the optimized conditions. Results The optimum concentration of potassium thiocyanate solution (0.15 mol/L) and sodium nitrite was 27.30 ml and 8.00 g/L, respectively, by series of experimental studies. Under the condition, the linear range of the standard curve was 0-500μg/L, the standard curve linear relationship coefficient≥0.9990;method detection limit was 5.94μg/L; in precision experiment of low, medium and high concentrations of iodine, the coefficients of variation were 1.19%, 1.92%and 2.06%;in accuracy test, recovery rates were 100.49%-107.84%, and the total recovery rate was 103.15%. Conclusions The flow injection analysis method can be used to replace arsenic cerium catalyzed spectrophotometric detection of iodide in water; when the method is used in detection of the sample water iodide content of 0 - 500 μg/L, it has good precision and accuracy, automatic injection, automatic filling reagents and automatic detection system to reduce the burden on the staff, with arsenic-free reagents and reduced environmental pollution and the health hazards of the inspectors, which is suitable for iodine screening in high iodine areas.

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Clinical features of 38 children with brucellosis

Chen LIANG ; Wei WEI ; Xiuwen LIANG ; Enjin DE ; Lijun WANG ; Muren BAO ; Gele CHEN

Chinese Journal of Endemiology.2017;36(8):590-592. doi:10.3760/cma.j.issn.2095-4255.2017.08.011

Objective To analyze clinical and laboratory results of 38 children with brucellosis for providing theoretical basis for its clinical diagnosis and treatment. Methods The epidemiology, clinical features, laboratory characteristics and therapeutic effect of pediatric patients at HulunBuir People's Hospital from January 2011 to December 2015, were retrospectively evaluated. Results Totally there were 38 child patients with brucellosis, 24 males and 14 females, 36 children had directly contacted with animals, and onset seasons were mainly in Summer and Autumn. The dominant manifestations were fever in 33 (86.8%), anorexia in 21 (55.3%), arthralgiaand myalgia in 17 (44.7%), hepatomegaly in 5 (13.2%), splenomegaly in 11 (28.9%), and lymph nodes enlargement in 10 (26.3%). Abnormal laboratory findings included elevated C-reactive protein (CRP) level in 27 (71.1%) and erythrocyte sedimentation rates (ESR) in 24 (63.2%). Both the Rose Bengal test and serum agglutination test (SAT) were positive in 37 patients, only one patient was negative but the blood culture was positive. After at least 12 weeks of combined, adequate and standardized treatment, there were 30 pediatric brucellosis patients cured, improved in 8 cases, the total effective rate was 100.0%. Conclusions In endemic regions, the presence of persistent fever, joint pain and hepatosplenomegaly should alert clinicians the possibility of brucellosis. Early diagnosis and treatment will reduce the incidence of complications.

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Contents of fluoride in corn and peppers in key regions of coal-burning-borne endemic fluorosis areas in Guizhou Province

Nianheng ZHANG ; Dong AN ; Dasheng LI ; Dancheng YAO ; Danya SHE ; Yu YANG ; Hongbing YE

Chinese Journal of Endemiology.2017;36(8):580-582. doi:10.3760/cma.j.issn.2095-4255.2017.08.008

Objective To investigate the content and changes of fluoride in corn and pepper, to evaluate the effect of prevention and control measures, and to provide a basis for adjusting the prevention and control strategy. Methods In 2013, according to the different directions of east, west, south, north and center, 5 townships were selected from each coal-burning-borne endemic fluorosis areas in all 23 counties (cities, districts), and 3 villages was randomly selected from each township. Household samples of corn and dried pepper in 10 households were collected to detect fluorine content. The results of 14 counties were compared with the 2007 survey data. Results A total of 884 and 3379 samples of corn and pepper were collected, and the median fluorine content was 1.26 and 9.15 mg/kg, the range was 0.50~254.59 mg/kg and 0.50~3701.88 mg/kg, respectively. Compared with the survey data of 2007, the median fluoride content of corn of 14 counties decreased by nearly 50%, and the median amount of pepper was reduced by more than 80%. The differences were statistically significant (mg/kg:corn 1.36 vs 2.63, dried pepper 9.70 vs 55.31, Z = 3.28, 9.13, P<0.05). Conclusion The fluoride content of corn and pepper in Guizhou Province is significantly lower, but it is still relatively high in some coal-burning-borne fluorosis counties (cities, districts).

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Infection status of principal human parasites in Nanchang City in 2014

Zhuhua HU ; Guohua PENG ; Renlong FU ; Ke QIAN ; Xiaowu FENG

Chinese Journal of Endemiology.2017;36(8):575-579. doi:10.3760/cma.j.issn.2095-4255.2017.08.007

Objective To understand and analyze the infection status of human parasites in Nanchang City, so as to offer a scientific basis for control of parasitic disease. Methods In 2014, a survey was performed according to the scheme of The 3rd National Survey of Principal Human Parasites. Intestinal parasites were surveyed among the residents in Jinxian County and Anyi County, Qingyunpu District and Qingshanhu District in Nanchang City, including the soil-transmitted nematodes (Ascaris lumbricoides, Trichuris trichiura and hookworm), Enterobius vermicularis, tapeworm and intestinal protozoa. Clonorchis sinensis was surveyed among the residents in Qingyunpu District and Qingshanhu District. Toxoplasma gondii was surveyed among the residents in two rural areas (Nanchang County and Xinjian County) and two urban areas (Donghu District and Xihu District). The ovums of the soil-transmitted nematodes, Clonorchis sinensis , tapeworm and other helminths were examined by the Kato-Katz, while Enterobius vermicularis among children was examined by cellophane anal swab, trophozoites and cysts of intestinal protozoa by saline smearing and iodine smearing , and IgG antibodies of Toxoplasma gondii by enzyme-linked immunosorbent assay (ELISA). Results Intestinal parasites were surveyed among 2424 residents in the whole city, in which 2414 residents were tested for the infection of soil-transmitted nematodes and tapeworm;1875 residents were tested for intestinal protozoa infection;74 children were tested for eggs of Enterobius vermicularis; 539 residents were tested for Clonorchis sinensis; and 2400 residents were tested for Toxoplasma gondii. Six kinds of intestinal parasites were found citywide, with a total infection rate of 9.49% (230/2424). The infection rate of soil-transmitted nematodes was 8 . 70% ( 210/2414 ) , in which the infection rate of Ascaris lumbricoides was 0.04% (1/2414), the rate of Trichuris trichiura was 0.91% (22/2414), and of hookworm was 7.83%(189/2414). The infection rate among 3 - 6 years old children of Enterobius vermicularis was 22.97% ( 17/74 ) . Tapeworm and Clonorchis sinensis were not found . The infection rate of intestinal protozoa was 0.21%(4/1875). The positive rate of Toxoplasma gondii's IgG antibody was 5.17% (124/2400). Conclusions In Nanchang City, the infection rate of soil-transmitted nematodes (Ascaris lumbricoides, Trichuris trichiura) and intestinal protozoa was lower. However, the infection rates of hookworm, Toxoplasma gondii and Enterobius vermicularis among 3 - 6 years old children are increasing in local areas. That should be the focus in prevention and control of parasitic disease in the future.

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Epidemiological analysis of malaria in Nanchang City, Jiangxi Province from 1950 to 2015

Renlong FU ; Xiaoqing LIU ; Haiying CHEN ; Guohua PENG ; Ke QIAN ; Xiaowu FENG

Chinese Journal of Endemiology.2017;36(8):570-574. doi:10.3760/cma.j.issn.2095-4255.2017.08.006

Objective To analyze the epidemiological characteristics of malaria and to discover the regularity of malaria outbreaks in Nanchang City from 1950 to 2015, so as to provide a scientific basis for developing control strategies after the goal of malaria elimination has been achieved. Method Malaria related data, report forms and work summary in Nanchang from 1950 to 2015 were collected and analyzed to indicate malaria distribution characteristics via the descriptive epidemiological methods. Results The total number of malaria cases reported in Nanchang City was 1449878 from 1950 to 2015. The particular years with the three peaks of malaria epidemic from 1950s to 1970s were 1954, 1970 and 1977. The climax of annual mean incidence rate of malaria (6948.75 per 100 thousand) was reached in 1970. Totally 1449739 local recurrence cases were reported between 1950 and 1999. There were 484292 local recurrence cases (accounting for 68.80%, 484292/703911) that were diagnosed in the malaria epidemic seasons, May to August. There were 44931, 25684, 22614 and 5842 cases reported in Nanchang County, Xinjian County, Jinxian County and Qingshanhu District, which ranked the top 4 of epidemic focus areas ( accounting for 90 . 65%, 99071/109293) between 1980 and 1989. The 13245 cases reported between 1972 and 1985 in the three county/districts (Jinxian County, Xihu District and Wanli District), included 8513 cases of male and 4732 cases of female. The 126 cases reported between 2005 and 2015, included 122 imported cases who were mostly returnees after overseas labor output and 57 falciparum malaria cases with a increasing trend year by year. There was no correlation between the seasonal change and the occurrence of malaria. Conclusions The comprehensive prevention and control measures based on eliminating the source of infection can effectively control the epidemic of malaria. It is suggested that the surveillance on imported falciparum malaria cases should be the focus in prevention and control of the disease at the late-stage because the epidemiological characteristics of local malaria cases have died out completely.

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