同时检测4种传染病病原体的蛋白质微阵列研究

[目的]建立1种用蛋白质微阵列法可同时检测血清中艾滋病病毒（HIV）抗体、丙型肝炎病毒（HCV）抗体、梅毒螺旋体（TP）抗体和乙型肝炎病毒表面抗原的方法。[方法]将基因工程HIV、HCV、TP重组抗原和乙肝病毒单克隆抗体共价结合于固相载体玻片上，制成蛋白质微阵列。血清样本经稀释、加样、孵育、洗涤后，加上Cy3荧光标记物，用激光芯片扫描系统对蛋白质微阵列进行扫描成像。将获得的图像用Imagene专用分析软件进行分析，所获数据根据cutoff值自动生成判断结果。用此蛋白微阵列系统检测了100份4个项目皆阴性的血清标本，确定了其cutoff值。检测了经酶联免疫吸附试验（EUSA）筛选出4个项目皆阴性的标本40例；艾滋病病毒抗体阳性标本30例；乙肝表面抗原、丙肝抗体、梅毒特异性抗体阳性血清各100份。[结果]蛋白质微阵列法检测艾滋病病毒抗体、丙肝抗体和乙型肝炎表面抗原的阳性和阴性标本的符合率皆为100％，梅毒特异性抗体阳性符合率为97％，阴性符合率为100％。[结论]蛋白质微阵列法检测HIV、HCV、TP和HBsAg与EUSA法检测结果具有高度的符合率。该法具有高通量、快速、特异性强、操作简便等特点，适用于大规模样本的分析，在卫生检疫传染病检测方面具有应用和推广价值。     

Centralized isolation of Helicobacter pylori from multiple centers and transport condition influences

AIM:To evaluate the efficacy of centralized culture and possible influencing factors.METHODS:From January 2010 to July 2012,66452 patients with suspected Helicobacter pylori(H.pylori) infection from 26 hospitals in Zhejiang and Jiangsu Provinces in China underwent gastrointestinal endoscopy.Gastric mucosal biopsies were taken from the antrum for culture.These biopsies were transported under natural environmental temperature to the central laboratory in Hangzhou city and divided into three groups based on their transport time:5,24 and 48 h.The culture results were reported after 72 h and the positive culture rates were analyzed by a χ2 test.An additional 5736 biopsies from H.pylori-positive patients(5646 rapid urease test-positive and 90 14C-urease breath test-positive) were also cultured for quality control in the central laboratory setting.RESULTS:The positive culture rate was 31.66%(21036/66452) for the patient samples and 71.72%(4114/5736) for the H.pylori-positive quality control specimens.In the 5 h transport group,the positiveculture rate was 30.99%(3865/12471),and 32.84%(14960/45553) in the 24 h transport group.In contrast,the positive culture rate declined significantly in the 48 h transport group(26.25%; P 0.001).During transportation,the average natural temperature increased from 4.67 to 29.14℃,while the positive culture rate declined from 36.67%(1462/3987) to 24.12%(1799/7459).When the temperature exceeded 24℃,the positive culture rate decreased significantly,especially in the 48 h transport group(23.17%).CONCLUSION:Transportation of specimens within 24 h and below 24℃ is reasonable and acceptable for centralized culture of multicenter H.pylori samples.     

The Association of Age and Antibiotic Resistance of Helicobacter Pylori: A Study in Jiaxing City,Zhejiang Province,China

The antibiotic resistance of Helicobacter pylori (H pylori) is steadily increasing worldwide, resulting in the low efficiency of the current therapeutic approaches for eradication. In this study, we investigated the relationship between antibiotic resistances, the year of sample collection, and the ages of the infected individuals.A total of 29,034 gastric mucosa biopsy samples were randomly collected from January 1, 2009 to December 9, 2014 in Jiaxing City, Zhejiang Province, China. An antibiotic susceptibility testing was determined using an agar-dilution method. The statistical significance was tested using the chi-squared (χ²) test.A total of 9687 strains were isolated. The resistance rate to clarithromycin, levofloxacin, and metronidazole were 17.76%, 19.66%, and 95.5%, respectively. Resistance was rare against amoxicillin, gentamicin, and furazolidone. The metronidazole resistance rate stayed at a consistently high level. In contrast, the resistance rates of clarithromycin and levofloxacin increased rapidly from 2009 to 2011, gradually decreased from 2012 to 2013, and then increased again in 2014. Although patients ages 31 to 50 and 71 to 80 years had lower infection rates of H pylori, they also had higher resistance rates to clarithromycin and levofloxacin. The highest antibiotic resistance rate was observed in patients’ ages 71 to 80 years old. Younger patients (below 30 years old) had a lower resistance to levofloxacin. Patients’ ages 51 to 60 years old may thus represent an important category for the future study of H pylori infection.Age plays a key element in H pylori resistance to clarithromycin and levofloxacin. It is therefore necessary to consider individualized therapy for the optimized treatment of H pylori-infected patients.