Prevalence of vacA, cagA and babA2 genes in Cuban Helicobacter pylori isolates

AIM： To investigate the prevalence of vacuolating cytotoxin （vacA）, cytotoxin associated gene A （cagA） and blood adhesion binding antigen （babA2） genotypes of Helicobacter pylori （H pylori） isolates from Cuban dyspeptic patients. METHODS： DNA was extracted from Hpylori-positive cultures taken from 130 dyspeptic patients. Genotyping was performed by PCR, using specific primers for vacA （s1, s2, m1, m2）, cagA and babA2 genes. Endoscopic observations and histological examinations were used to determine patient pathologies. RESULTS： vacA alleles s1, s2, m1 and m2 were detected in 96 （73.8%）, 34 （26.2%）, 75 （57.7%） and 52 isolates （40%）, respectively, while the cagA gene was detected in 95 isolates （73.2%）. One hundred and seven isolates （82.3%） were babA2-positive. A significant correlation was observed between vacAs1m1 and cagA and between vacAs1ml and babA2 genotypes （P 〈 0.001 and P 〈 0.05, respectively） and between babA2 genotype and cagA status （P 〈 0.05）; but, no correlation was observed between vacAsl and babA2 genotypes. Eighty five （65.4%） and 73 （56.2%） strains were type 1 （vacAsl-cagA-positive） and ＂triplepositive＂ （vacAs1-cagA-babA2-positive）, respectively, and their presence was significantly associated with duodenal ulcer （P 〈 0.01 and P 〈 0.001, respectively）. CONCLUSION： The distribution of the main virulence factors in the Cuban strains in this study resembled that of the Western-type strains, and the more virulent H pylori isolates were significantly associated with duodenal ulcer, ulcer disease being the worst pathology observed in the group studied.

脑卒中阴虚风动型颈动脉硬化与HP CagA^-VacA^-相关性研究

目的研究幽门螺旋杆菌(HP)Cag A-Vac A-感染在阴虚风动型脑卒中颈动脉粥样硬化发生发展中的作用。方法对108例脑卒中患者运用病例对照的方法,对脑卒中组和健康组的血清HP不同亚型抗体和相关基因进行检测。结果阴虚风动证脑卒中患者颈动脉粥样硬化HP阳性率明显高于健康组(P<0.05);HP Cag A-Vac A-感染率(62.0%)占优势(P<0.05),比值比(OR)及95%可信区间(CI)是2.04(1.10~3.93),经调整各匹配因素后OR及95%CI为3.18(2.40~5.18)。结论阴虚风动型脑卒中颈动脉粥样硬化患者与HP感染相关,其中Cag A-Vac A-菌株作用明显。

Helicobacter pylori cagA,iceA and vacA genotypes in patients with gastric cancer in Taiwan

AIM: Helicobacter pylori( H pylori) has been linked to chronic gastritis, peptic ulcer, gastric cancer and MALT-lymphoma.The link of genotypes of Hpylorito gastric cancer remains controversial. The aim of this study was to investigate the Hpylori vacA alleles, cagA and iceA in patients with gastric cancer in Taiwan.METHODS: Patients with gastric cancer, peptic ulcer and chronic gastritis were enrolled in this study. We obtained biopsy specimens from the stomach at least 2 cm away from the tumor margin in patients with gastric cancer, and from the antrum of stomach in patients with peptic ulcer or chronic gastritis. DNA extraction and polymerase chain reaction were used to detect the presence or absence of cagA and to assess the polymorphism of vacA and iceA.RESULTS: A total of 168 patients (gastric ulcer: 77, duodenal ulcer: 66, and chronic gastritis: 25) were found to have positive PCR results of the biopsy specimens from patients with peptic ulcer and chronic gastritis. We found positive cagA (139/168, 83%), m2 (84/168, 50%) and iceA1 (125/168,74%) strains in the majority of patients. In patients with gastric cancer, the vacA sla and slc subtypes were less commonly found than those in non-cancer patients (35/66 vs 127/168, P= 0.0001 for sla and 13/66 vs93/168, P<0.0001 for slc). In the middle region, the mlT strain in patients with gastric cancer was more than that of non-cancer patients(23/66 vs 33/168, P = 0.02).CONCLUSION: In Taiwan, H pylori with positive vacA sla,cagA and iceA1 strains are found in the majority of patients with gastric cancer or non-cancer patients. In patients with gastric cancer, the vacA s1a and slc subtypes are less and m1T is more than in patients with peptic ulcer and chronic gastritis.

Hp cagA、vacA s1m2基因与萎缩性胃炎疾病诊断的相关性研究

目的研究幽门螺旋杆菌cagA、vacA s1m2基因与萎缩性胃炎疾病诊断的相关性。方法回顾性选取南京梅山医院2017年2月至2018年2月期间内进行胃镜检查的100例胃炎患者为研究对象,其中浅表性胃炎37例,萎缩性胃炎35例,胃溃疡28例。PCR检测三组患者的胃黏膜组织的幽门螺旋杆菌cagA、vacA s1m2基因表达,分析三组患者的cagA、vacA s1m2基因与萎缩性胃炎疾病诊断的相关性。使用ROC曲线,分别对cagA、vacA s1m2单独检测和联合检测,分析其诊断灵敏度之间的差异。结果通过对患者的cagA、vacA s1m2基因分析,三组患者的cagA、vacA s1m2基因阳性情况表达之间的差异存在统计学意义(P<0.05),其中,cagA基因表达率从高到低依次为胃溃疡、萎缩性胃炎以及浅表性胃炎,而vacA s1m2基因表达率从高到低依次为萎缩性胃炎、浅表性胃炎、胃溃疡。浅表性胃炎、萎缩性胃炎以及胃溃疡患者的诊断与幽门螺旋杆菌的cagA、vacA s1m2的基因相对表达量呈现正相关,联合检测诊断效能显著高于单独检测,差异存在统计学意义(P<0.05)。结论幽门螺旋杆菌的诊断与患者的cagA基因表达以及vacA s1m2基因表达呈现显著相关性,建议在临床诊断中进行推广。

Analysis of serum antibody profile against H pylori VacA and CagA antigens in Turkish patients with duodenal ulcer

AIM: To investigate the frequency of seropositivity aga- inst CagA, VacA proteins and to determine their indepen- dent effects on the development of duodenal ulcer (DU) in Turkish patients. METHODS: The study was designed as a prospective one from a tertiary referral hospital. Dyspeptic patients who were referred to our endoscopy unit for upper gas- trointestinal endoscopy between June 2003 and March 2004 and diagnosed to have DU or nonulcer dyspepsia (NUD) were included. Biopsies from the antrum and body of the stomach were taken in order to assess the current H pylori status by histology, rapid urease test and culture. Fasting sera were obtained from all patients and H pylori status of all sera was determined by IgG antibo- dies using an enzyme-linked immunosorbent assay (ELI- SA) kit. All seropositive patients were further analysed using Western blot assays detecting IgG antibodies aga- inst CagA and VacA proteins. The χ2 test was used for statistical comparison of the values and age-sex adjusted multiple regression analysis was used to determine the independent effects of CagA and VacA seropositivities on the development of DU. RESULTS: Sixty-three patients with DU and 62 patients with NUD were eligible for the final analysis. Seropositi- vity for anti-CagA was detected in 51 of 62 (82%), andin 55 of 63 (87%) patients with NUD and DU, respec- tively (p = no significance), and seropositivity for anti- VacA was found in 25 of 62 (40% ) and in 16 of 63 (25%) patients, with NUD and DU, respectively. CONCLUSION: These findings suggest that none of the- se virulence factors is associated with the development of DU in the studied Turkish patients with dyspepsia.

The Mechanism of CagA and VacA in Gastric Cancer under the Tumor Microenvironment and Vitro Factors

Gastric cancer is closely related to the stomach microbiota,especially Helicobacter pylori.Numerous reports and clinical studies have shown that microbial behavior in the stomach may lead to pathological changes in the gastrointestinal tract of the host,which ultimately leads to the production and development of gastric cancer.This review outlines the major pathogenic processes of Helicobacter pylori in the stomach,specifically focusing on Cag A,Vac A,inflammatory pathways and oxidative stress.In addition,we describe the effects of some non-Helicobacter pylori factors,such as other microbiota,alcohol,and tobacco,on the carcinogenesis induced by Helicobacter pylori.The effects of family history are also taken into account.We hope that understanding the stomach microbiota will make it possible to more easily prevent,detect and treat gastric cancer.

Helicobacter pylori Virulence Genes cagA, babA2, and vacA Detection in Dyspeptic Patients from Burkina Faso

The diverse clinical presentation of Helicobacter pylori (H. pylori) infection results from the interaction between bacterial virulence, host genetics, socio-demographic and environmental factors. This study aimed to characterize Helicobacter pylori virulence genes and the associated behavioral factors among dyspeptic patients in Burkina Faso. Two hundred and fifty (250) stool samples were collected from patients with dyspepsia seen at health centers in Ouagadougou, Burkina Faso. Bacterial deoxyribonucleic acid (DNA) was extracted using a commercial kit. Virulence genes were detected using conventional multiplex Polymerase Chain Reaction with specific primers. The overall prevalence of Helicobacter pylori of the 250 participants was 91.20%. CagA virulence gene was present among 20.19% of individuals, while babA2 and vacA were detected respectively among 9.65% and 67.54% of the population positive for Helicobacter pylori. Among vacA subtypes, vacAs1 was the most frequent, with 39.04%, followed by vacAi1 (19.74%), vacAi2 (17.54%), and vacAs2 with 10.96%. Regarding vacAm1 and vacAm2, they were less frequent at 6.14% each. “Handwashing three times or less per day” significantly increased the risk of having vacAi2 allele and H. pylori rRNA16s, with p-values of 0.013 and 0.020, respectively. The consumption of non-tap water increases the risk of carrying the cagA virulence gene. Additionally, H. pylori-positive patients living with more than four (4) people in their household had about two times the risk of having the vacAs1 allele. The present study shows the detection of Helicobacter pylori cagA, vacA subtypes, and babA2 by stool a PCR method in Burkina Faso. The strong association between sanitary habits and virulence factors depicts the composite interaction between ecological factors, gastric mucosa, and bacteria. Therefore, the synergic action of these factors should be considered when aiming for bacterial eradication and gastric pathology cure.

Helicobacter pylori vac A genotype is a predominant determinant of immune response to Helicobacter pylori CagA

To evaluate the frequency of Helicobacter pylori (H. pylori) CagA antibodies in H. pylori infected subjects and to identify potential histopathological and bacterial factors related to H. pylori CagA-immune response. METHODSSystematic data to H. pylori isolates, blood samples, gastric biopsies for histological and molecular analyses were available from 99 prospectively recruited subjects. Serological profile (anti-H. pylori, anti-CagA) was correlated with H. pylori isolates (cagA, EPIYA, vacA s/m genotype), histology (Sydney classification) and mucosal interleukin-8 (IL-8) mRNA and protein expression. Selected H. pylori strains were assessed for H. pylori CagA protein expression and IL-8 induction in co-cultivation model with AGS cells. RESULTSThirty point three percent of microbiologically confirmed H. pylori infected patients were seropositive for CagA. Majority of H. pylori isolates were cagA gene positive (93.9%) with following vacA polymorphisms: 42.4% vacA s1m1, 23.2% s1m2 and 34.3% s2m2. Anti-CagA-IgG seropositivity was strongly associated with atrophic gastritis, increased mucosal inflammation according to the Sydney score, IL-8 and cagA mRNA expression. VacA s and m polymorphisms were the major determinants for positive (vacA s1m1) or negative (vacA s2m2) anti-CagA serological immune response, which also correlated with the in vitro inflammatory potential in AGS cells. In vitro co-cultivation of representative H. pylori strains with AGS cells confirmed functional CagA translocation, which showed only partial correlation with CagA seropositivity in patients, supporting vacA as major co-determinant of the immune response. CONCLUSIONSerological immune response to H. pylori cagA+ strain in H. pylori infected patients is strongly associated with vacA polymorphism, suggesting the crucial role of bacterial factors in immune and clinical phenotype of the infection.

幽门螺杆菌cagA、vacA抗体与胃十二指肠疾病的相关性研究

目的 :探讨幽门螺杆菌 (Hp)毒力基因cagA、vacA抗体与胃十二指肠疾病之间的关系。方法 :采用免疫印迹法检测 440例胃十二指肠疾病患者血清中的cagA、vacA抗体。结果 :cagA、vacA抗体在 440例患者中的检出率分别为 73 %、37.0 %。在慢性胃炎 (CG)、十二指肠球部溃疡 (DU)、胃癌 (GC)患者中 ,cagA、vacA抗体的阳性率分别为 62 .9% ,76 .1 %、96 .9%与 33 .0 %、31 .0 %、62 .5 % ;经u检验显示 :慢性胃炎组与十二指肠球部溃疡组比较 ,无明显差异。胃癌组与慢性胃炎组、十二指肠球部溃疡组比较 ,有显著性差异。结论 :本文通过患者血清中Hp抗体 (cagA和vacA)的检测 ,推知其cagA和vacA抗体的表达状况 ,可为胃十二指肠疾病的诊断提供依据 。

幽门螺杆菌及其vacA基因亚型和cagA基因与胃上皮HLA-DR抗原表达的关系

【目的】探讨幽门螺杆菌及其空泡毒素基因 (vacA)亚型、细胞毒素相关基因 (cagA)与胃上皮HLA DR抗原表达间的关系。【方法】①自 39例幽门螺杆菌阳性患者中分离培养出 39株幽门螺杆菌菌株 ,采用PCR方法鉴定 39株菌株的ca gA及vacA亚型 ;②采用HLA DR小鼠抗人单克隆抗体 ,对上述已行cagA及vacA亚型鉴定的幽门螺杆菌阳性患者及 2 2例阴性患者的胃窦活检标本行免疫组化染色。【结果】①幽门螺杆菌阳性患者胃上皮HLA DR表达较阴性患者更显著 ;②幽门螺杆菌定植密度与胃上皮HLA DR抗原表达程度间存在正相关 ;③感染cagA+ 菌株患者较感染cagA-株者胃上皮HLA DR抗原表达更明显 ;④本研究中vacAs1a/m2亚型占 90 % ,故未对不同vacA亚型与胃上皮HLA DR表达间的关系进行统计分析。【结论】①幽门螺杆菌感染可诱导胃上皮HLA DR抗原异常表达 ;②cagA+ 菌株可能通过胃上皮HLA Ⅱ类分子介导而与宿主发生更为密切的相互作用 ,从而较cagA-菌株引起更为显著的胃上皮损伤。

CagA^+及VacA^+幽门螺杆菌对克拉霉素的耐药性突变分析

目的分析CagA+及VacA+的幽门螺杆菌(Hp)对克拉霉素耐药与23S rRNA基因点突变的关系。方法采集右江民族医学院附属医院2006~2008年确诊为Hp感染患者的胃窦部黏膜样本进行Hp分离培养和鉴定,PCR扩增CagA+及VacA+基因,E-test进行药敏实验,PCR方法扩增23S rRNA基因,基因测序检测克拉霉素耐药菌株的点突变。结果对克拉霉素耐药的CagA+及VacA+Hp菌株均存在23S rRNA基因v功能区第2144位和第2143位A-G突变,而敏感菌株没有发现该位点突变。结论Hp对克拉霉素耐药的23S rRNA基因A2143G、A2144G点发生突变,与基因分型无关。

幽门螺杆菌vacA和cagA基因全长分子系统发育分析

文章从GenBank中下载所有含有vacA和cagA基因的H.pylori菌株的VacA和CagA全长氨基酸序列,利用ClastalX 2.0和MEGA 5.05软件构建VacA和CagA分子系统发育树,探讨两基因之间的分子系统发育关系和不同聚类群的临床感染结果与基因型特征。结果显示,VacA和CagA具有高度相似的分子系统发育树,并且所有H.pylori菌株在系统发育树中具有相同的分布特点,分别聚类为东亚株群1、2和西方株群3个聚类群。其中东亚株群1患萎缩性胃炎比例较高,vacA基因型以s1c/m1b和s1a/m1b为主,cagA基因型以EPIYA-ABD为主;东亚株群2患十二指肠溃疡的比例较高,vacA基因型以s1c/m2和s1a/m2为主,cagA基因型以EPIYA-AB'C为主;西方株群患十二指肠溃疡和胃炎的比例相当,萎缩性胃炎比例较低,vacA基因型以s1a/m1a和s1b/m1a为主,cagA基因型以EPIYA-AB/B'CC为主。这些结果说明,vacA和cagA基因可能具有共进化的遗传关系;东亚株群1、2和西方株群分别具有不同的vacA和cagA基因亚型,这可能与其临床感染结果密切相关,因此,在进行H.pylori相关性疾病分析时,有必要结合vacA和cagA基因型的亚型做深入分析。

幽门螺杆菌vacA及cagA基因型与胃疾病的关系

目的探讨幽门螺杆菌(Hp)vacA、cagA基因型与胃疾病的关系。方法选取105例胃疾病病人,包括慢性浅表性胃炎(CSG)45例,慢性萎缩性胃炎(CAG)48例,胃癌(GC)12例。于胃窦处取3块胃黏膜,分别进行快速尿素酶反应、病理检查和聚合酶链反应(PCR)。提取胃黏膜基因组DNA,用6对引物检测Hp vacA、cagA基因的表达。结果快速尿素酶反应、病理检查均阳性的标本57例,Hp的阳性率为54.2%(57/105)。Hp vacA s1/m2、s1/m1、s2/m1、s2/m2的阳性率分别为53%(30/57)、18%(10/57)、8%(5/57)、21%(12/57);Hp cagA的阳性率为89%(51/57)。vacA、cagA基因型在CSG、CAG和GC之间差异无显著性(P>0.05)。结论Hp菌株的优势基因亚型为Hp cagA、vacA s1/m2;Hp vacA、cagA基因与特定胃疾病间无显著相关性,不能预示Hp感染的临床结果。

贵阳地区幽门螺杆菌临床分离株中ureA、cagA、vacA、iceA基因的分布及分析

目的了解贵阳地区临床分离的幽门螺杆菌(Hp)的毒力基因ureA、cagA、vacA、iceA的分布特征,探讨不同毒力基因型与上消化道疾病的关系。方法用特异的16SrDNA聚合酶链反应进行临床分离Hp的菌种鉴定,对经过鉴定的152株幽门螺杆菌进行ureA、cagA、vacA、iceA基因及亚型的PCR检测。结果 ureA基因的检出率为100%(152/152),vacA基因的检出率为100%(152/152),vacA基因亚型以s1a-m2型为主,占76.3%(116/152),cagA基因检出率为39.5%(60/152),ieeA1基因检出率36.8%(56/152),iceA2基因检出率为34.2%(52/152),13.2%(20/152)的菌株iceA1和iceA2基因均阳性,不同基因型菌株在慢性胃炎和消化性溃疡中的检出率无统计学意义(P>0.05)。结论贵阳地区幽门螺杆菌毒力基因vacA以s1a-m2型为主,cagA阴性比例高于cagA阳性,不同基因型菌株与消化性疾病间无明显相关性。

幽门螺杆菌VacA、CagA及BabA蛋白的二级结构和免疫表位预测分析

目的:预测幽门螺杆菌的重要抗原组分VacA、CagA及BabA蛋白的二级结构和B细胞表位。方法:基于序列比对和进化树分析,选择幽门螺杆菌J99作为源菌株,进行相关蛋白质二级结构和免疫表位的预测。应用DNASTAR Protean软件,通过Chou-Fasman和Garnier-Robson方法,预测α螺旋、β折叠、转角以及卷曲结构;通过Jameson-Wolf、Emini、Kyte-Doolittle和Karplus-Schulz方法,分别预测抗原性指数、表面可能性、氨基酸亲水性和柔性区域。结果:VacA和BabA有较多的β折叠,CagA主要由大量α螺旋组成,三者转角或卷曲的构成比例则基本相似。VacA蛋白有5～11、28～31和1 235～1 243等18个优势B细胞表位区段,BabA的优势表位有19～25、41～55和692～702等16个区段;CagA有更多的B细胞表位,主要分布在5～12、40～57及1 154～1 167等30个区段。结论:基本明确了VacA、CagA及BabA蛋白的二级结构特征和B细胞表位区段,为进一步通过动物实验筛选出高效表位奠定了基础。

幽门螺杆菌vacA基因分型和cagA基因检测

〔目的〕建立检测幽门螺杆菌 (Hp)的 cag A、vac A基因及其基因型的方法 ,观察 vac A基因型与 cag A状态的相关性。〔方法〕应用聚合酶链反应 (PCR)对 172份 Hp阳性标本进行 Hp cag A和 vac A基因检测及其基因型分析。〔结果〕 172份 Hp阳性标本中 ,vac A阳性数 172 (10 0 % ) ,cag A阳性数 93(5 4.0 7% ) ;49例萎缩性胃炎患者中 ,cag A阳性菌株感染 47例 (95 .92 % ) ,6 4例浅表性胃炎患者中 ,vac A阳性菌株感染 2 8例 (4 3.75 % ) ,两者有显著差异 (p<0 .0 5 ) ;vac A中间区域型 m1和 m2分别为 80和 92例 ,两者无明显差异 (p>0 .0 5 ) ,信号序列型 sla、slb、s2分别为 82、6 8、2 2例 ,sla与slb无明显差异 (P>0 .0 5 ) ,sla、slb、sl(sla+ slb)均显著多于 s2型 (p<0 .0 5 )。检出所有的 6种信号序列 /中间区域组合型 ,slb/ m l和 sla/ m2分别为 48和 5 2例 ,明显多于其它基因型 (p<0 .0 5 ) ,s2 / ml仅为 2列 ,明显少于其它基因型 (p<0 .0 1)。对 Hp vac A基因型与 cag A状态相关性分析 ,s1/ m1、s1/ m2、s2 / m1、s2 / m2型的 cag A阳性数为分别为 45、48、0、0 ,93份 cag A阳性标本均为 s1(s1/ m1+ s1/ m2 )。〔结论〕vac A基因存在于所有 Hp中 ,而 cag A基因仅存在于 5 0 %～6 0 %的 Hp中 ,vac A

CagA和VacA不能作为幽门螺杆菌相关性疾病的预测因子

目的:CagA和VacA能否作为幽门螺杆菌(H.pylori)相关性疾病的预测因子尚有争论,本文旨在研究胃癌高发区的福州市不同胃病患者的H.prLori CagA和VacA的检出率,探讨这二者作为H.pylori毒力标志物的可行性。 方法:胃镜或手术及病理证实的慢性胃病患者170例纳入研究,胃窦癌(CC)34例,十二指肠溃疡(DU)39例,胃溃疡(GU)35例,慢性胃炎62例。无症状的健康志愿者36名为对照组,免疫印迹法检测血清中H.pylori抗体。部分患者同时接受^(14)碳-尿素呼气检测。 结果:DU组、GU组和GC组的HP血清学阳性率高于胃炎组(X^2=4.84,P=0.028)和对照组(X^2=25.877,P<0.001),DU组与GU组、GC组之间的差异无显著性意义(X^2=3.306,P=0.191)。DU组的呼气实验阳性率高于GC组(X^2=16.463,P<0.001)、胃炎组(X^2=4.31,P=0.038)和对照组(X^2=33.33,P<0.001),GU组和胃炎组高于对照组(P<0.05);而DU组与GU组之间、GC组和对照组之间的差异均无统计学意义(P=0.144)。根据免疫印迹结果进行分型,各组间CgaA、VacA和Ⅰ型菌(CagA+、VacA+)阳性率无显著性差异(P>0.05)。 结论:尽管H.pylori感染与慢性胃病有关,但血清CagA和VacA抗体对预测H.pylori感染的后果没有意义。

海南汉族居民胃十二指肠疾病与幽门螺杆菌cagA,vacA和babA2基因型的关系

目的调查海南汉族居民慢性胃炎、消化性溃疡、胃癌患者中幽门螺杆菌(Helicobacter pylori,H.pylori)babA2,cagA,vacA基因型和亚型的分布,探讨H.pylori基因型差异与临床感染结局的关系。方法从自176例胃十二指肠疾病患者的胃镜活检胃黏膜标本中分离幽门螺杆菌菌株,提取幽门螺杆菌DNA,用聚合酶链反应检测H.pylori的cagA、vacA(vacAs1/vacAs2/vacAm1/vacAm2)及babA2基因型。结果176例患者中H.pylorica-gA的阳性率72.72%(128/176);babA2 54.55%(96/176);vacAs1 73.30%(129/176);vacAm2 67.05%(118/176);va-cAs1/cagA65.34%(115/176);vacAs1/babA2 51.70%(91/176);cagA/babA2 50.00%(88/176);vacAs1/cagA/babA251.14%(90/176)。慢性萎缩性胃炎、消化性溃疡和胃癌患者中vacAs1,cagA,cagA/vacAs1基因型阳性率明显高于慢性浅表性胃炎患者(P<0.05)。其他基因型在各疾病间分布的差异无显著性(P>0.05)。结论海南汉族H.pylori感染的优势基因型为cagA,vacAsl,vacAm2,cagA/vacAs1。慢性萎缩性胃炎、消化性溃疡、胃癌患者中va-cAs1、cagA、cagA/vacAs1基因型更多见。未发现babA2基因型与H.pylori临床感染结局的相关性。