瑶族无偿献血者人细小病毒B19与TTV重叠感染分析简

目的 了解广东瑶族无偿献血者人细小病毒B19及TTV重叠感染现状,探讨HPV B19与TTV感染相关性.方法 采用ELISA法检测HPV B19 IgG和抗-TTV IgG,并采用PCR法对部分血样进行HPV B19 DNA及TTV DNA检测.结果 376例无偿献血者血液标本中,检出HPV B19 IgG阳性110例,阳性率29.26％,检出抗-TTV IgG阳性176例,阳性率46.81％.147例血样检出HPV B19 DNA 10例,阳性率6.80％,检出TTV DNA 12例,阳性率8.16％.两者阳性检出率差异有统计学意义（x2=21.279,P＜0.05）. 67例抗-TTV IgG阳性中HPV B19的检出率为35.82％,43例HPV B19 IgG阳性中TTV的检出率为53.49％,两者检出率差异无统计学意义（x2=3.341,P＞0.05）.在阴性血液中,HPV B19总阳性检出率为36.25％,TTV总阳性检出率为53.85％,两者阳性率比较差异有统计学意义（x2＝5.633,P＜0.05）.结论 广东瑶族无偿献血者存在较高的HPV B19与TTV重叠感染,目前尚未在献血人群中开展HPV B19及TTV筛查,存在输血传播的风险.     

套式PCR技术检测肝癌和肝硬化患者TTV DNA

目的 了解肝癌和肝硬化患者中TTV DNA感染状况。方法 采用套式PCR技术检测TTV DNA及血清稀释法检测血清TTV DNA的滴度。结果 山东肝癌25例标本中8例TTVDNA阳性,阳性率为32．0％;广州肝癌16例中6例TTV DNA阳性,阳性率为37．5％;广西肝癌65例中28例TTV DNA阳性,阳性率为43．1％。16例肝硬化标本中6例TTV DNA阳性,阳性率为37．5％。结论 研究证实中国肝癌和肝硬化患者中存在35．7％的TTV DNA感染,这种TTV DNA感染是否对肝癌和肝硬化有促进作用,尚待进一步研究证实。     

外周血单个核细胞中一种新的DNA病毒(TTV)序列测定

作者对48例儿童及33例成人的81份外周血单个核细胞(CBMC)DNA样品,22份脐血单个核细胞(CBMC)DNA样品以及7份尸体肝组织DNA样品,采用半巢式聚合酶链反应(PCR)检测一种新的DNA病毒(TTV)序列。PCR使用公开发表的引物(NG059,NG061,NG063)以扩增TTV DNA序列。采用直接凝胶分析法在81份PBMC DNA样品中检出4份(5％)病毒DNA序列,CBMC DNA样品中无(0％),7份尸体肝组织DNA样品中检出2份(29％)。用直接测序测定PCR扩增产物。测序结果显示有相当大的差异性,与TTV原型测序结果相比,在6     

我国部分地区人群中TT病毒感染的分子流行病学

目的　了解我国不同地区和人群中 TTV DNA的感染情况。方法　采用巢式 PCR方法检测血清标本 TTVDNA。结果　在 2 1 4例各型病毒性肝炎患者中 ,检出 TTV DNA阳性 5 7例 ,阳性率为 2 6.64%。在甲～戊型肝炎、非甲～戊型肝炎、有偿献血者和正常人群中 ,TTV DNA流行率分别为 2 5 .97% ( 4 0 /1 5 4)、2 8.3 3 % ( 1 7/60 )、3 9.2 9% ( 2 2 /5 6)和 1 7.86%( 1 0 /5 6) ,四组差异亦无显著性 ( P>0 .0 5 ) ;我国北京、沈阳、南京、合肥和深圳的非甲～戊型肝炎患者中 TTV DNA流行率为 2 9.5 7% ( 68/2 3 0 ) ,与上述甲～戊型肝炎组比较差异亦无显著性 ( P>0 .0 5 )。结论　我国不同地区人群中存在 TTV DNA感染 ,各型病毒性肝炎患者和正常人群中 TTV DNA流行率较高。     

血液透析患者单个核细胞中TTV-DNA的研究

目的 :探讨血液透析患者血清和外周血单个核细胞 (PBMC)中输血传播病毒 (TTV)检测状况及意义。方法 :采用聚合酶链反应 (PCR)对 6 6例血液透析患者血清及PBMC进行TTV DNA检测 ,同时采用酶免疫分析 (EIA)检测血清中HBsAg和抗 HCV。结果 :血液透析患者TTV、HCV、HBV检出率分别为 18.2 %、2 4 .2 %、7.6 %。血清TTV DNA阳性与阴性患者 ,抗 HCV阳性率分别为 9.1%与 2 7.3% ,HBsAg阳性率分别为 0 %与 9.1% ,经统计学分析均无显著差异。PBMC中TTV DNA检出率 2 2 .7% ,PBMC中TTV DNA检出率在血清TTV DNA阳性者显著高于血清TTV DNA阴性者 (5 8.3%vs 14 .8% ,P<0 .0 5 )。结论 :血液透析患者TTV感染不依赖于HCV或HBV而存在。PBMC中TTV DNA主要在血清TTV DNA阳性患者中检出 ,PBMC可能是TTV的一个贮存场所。     

肝癌和肝硬化患者TTV感染的研究

目的 了解肝癌和肝硬化患者输血传染病毒(transfusion transmitted virus,TTV)感染状况。方法 采用套式PCR技术检测及血清稀释法检测血清TTV滴度。结果 肝癌中TTV阳性为山东临沂8例(8/25)、广州6例(6/16)、广西28例(28/65);肝硬化中TFV阳性为6例(6/16)。结论 本组肝癌和肝硬化患者中39.3％的TTV感染,TTV感染可能对肝癌、肝硬化有促进作用。     

维持性血液透析患者经血液传播嗜肝病毒感染状况

目的：探讨血液透析（血透）患者HBV,HCV,HDV,HGV和TTV等经血液传播的肝炎病毒感染状况。方法;对80例长期维持性血透患者和12位血透工作人员应用ELISA法检测HBV两对半及HCV,HDV抗体;逆转录－套式PCR检测血清HGV RNA;巢式PCR检测TTV DNA。结果：80例患者中,经血液传播肝炎病毒感染51例（63.8%),其中HBV阳性21例（22.5％）,未检出HDV,HGV阳性15例（18.7％）,TTV阳性28例（35％）。二重或二重以上感染18例（22.5％）,其中二重感染12例（15.2%) ,三重感染4例（5％）,四重感染2例（2.5％）。HBV单独感染8例（10％）,合并HCV感染4例（5％）,合并TTV感染4例（5％）;与HGV和TTV三重感染3例（3.8％）,与HCV,HGV和TTV四重感染2例（2.5％）。HCV单独感染10例（12.5％）,合计TTV感染1例（1.2％）;与HGV和TTV三重感染1例（12.5％）。HGV单独感染8例（10％）,合并TTV感染2例（2.5％）。TTV单独感染15例（18.8％）。12例工作人员HBV,HCV,HDV和HGV检测均阴性,1例TTV阳性。与非输血组相比,输血 组除HDV外,HGV,HBV,HCV和TTV的感染率明显增加,均P＜0.05。结论：血液透析患者经血液传播性肝炎病毒感染严重,重叠感染率高,其高发生率与输血有关。     

骨髓移植受者中的TT病毒

TT病毒(TTV)是一种新发现的输血相关DNA病毒,它可引起输血后肝炎。在日本供血者中,检出率为12％。本研究是为了调查在骨髓移植(BMT)受者中TTV的流行率和临床影响。25例BMT受者在移植后6～12周时采集血样,用半巢式PCR法检测TTV-DNA。移植后,25例受者中有15例(60％)TTV-DNA为阳性。而20例供者中只有2例(10％)为阳性。移植前TTV-DNA为阳性的受者在移植后的骨髓抑制期间其TTV-DNA数量下降到检测水平以下。作者使用核酸序列分析发现了一个新的TTV亚型,G3。在TTV阳性和阴性的受者中,其     

供血员、血液透析及非甲～庚型肝炎患者中TTV的感染状况

了解供血员,血液透析及非甲－庚型肝炎患者中输血传播病毒的感染状况,方法对４０份供血员标本,２７例血液透析及６０例散发性非甲－庚型肝炎患者血清标本,采用ＰＣＲ方法检测ＴＴＶ－ＤＮＡ,分析ＴＴＶ的感染状况。结果：４０份供血员血清中,有５例检出ＴＴＶ－ＤＮＡ阳性,检出率为１２．５％;血液透析患者中ＴＴＶ的检出率为２２．２％（６／２７）,而６０例散发性非－庚型肝炎患者血清中,无１例检出ＴＴＶ－ＤＮＡ。在１     

埃及慢性肝炎患者和无偿供血者TT病毒的临床意义

本文应用截面分析方法对埃及慢性肝炎患者和无偿供血者TT病毒(TTV)的临床意义进行了调查。使用半巢式PCR方法检测TTV DNA。慢性乙肝、慢性丙肝和血吸虫肝病患者中的TTV DNA流行率无差异(11/24,46％;22/72,31％;14/39,36％)。供血者的流行率(32/109,29％)与各组肝炎患者无差异。在任何一研究组中,TTV DNA阳性和阴性两者间的临床背景资料包括:平均年龄、性别、输血史、ALT值均无差异。表明在每个慢性肝炎组中,超声波扫描TTV DNA阳性和阴性患者两者间的肝化程度相似。在供血者中,TTV感染与HBV、HCV感     

Prevalence of the newly described human circovirus, TTV, in United States blood donors

BACKGROUND: A novel nonenveloped single-stranded circular DNA virus (TTV) was recently identified. The prevalence of TTV in blood donors in the United States is, however, still unclear. STUDY DESIGN AND METHODS: Viral DNA was detected in US blood donors from five cities by using two sets of TTV primers: NG059/NG061/NG063 primers, which amplified the conserved region of strains 1 and 2, and T801/T935 primers, which amplified the 5' end region of the TTV sequence. A TTV antibody assay system was based on the detection of the truncated open reading frame (ORF)-1 (amino acids 1-411) from type 1b. The truncated ORF-1 was expressed as a fusion protein in Escherichia coli, and the fusion protein was used as the antigen in the antibody assay system. RESULTS: Viremia was detected in 21 (8. 4%) of 250 donors by use of NG059/NG061/NG063 primers and 104 (41. 6%) of 250 by use of T801/T935 primers. There was little correlation among the assays, which suggests the preferential detection of different strains with the different primers. TTV antibody was detected in 38 of 100 donors: 32 (84%) of 38 with concurrent TTV viremia and 6 (16%) of 38 without TTV viremia. TTV viremia and/or TTV antibody-positive samples were detected in 52 (52%) of 100 of US blood donors. CONCLUSION: Evidence of infection or exposure to TTV appears to be common among blood donors in United States.     

83例静脉药瘾者的TT病毒感染状况

目的：调查静脉药瘾者中ＴＴ病毒（ＴＴＶ）的感染状况。方法：在ＴＴ病毒开放读码框（ＯＲＦ）１保守区设计引物,建立巢式ＰＣＲ,检测８３例静脉药瘾者和１０５名献血员血清中ＴＴＶ ＤＮＡ。结果：８３例静脉药瘾者中３３例ＴＴＶ ＤＮＡ阳性,阳性率为４０％,而献血员的阳性率为１１％（Ｐ〈０．０５）。结论：静脉药瘾者是ＴＴ病毒感染的高危人群,不洁注射是感染ＴＴ病毒的重要途径。     

献血者TT病毒DNA及其IgG抗体的检测

目的　观察献血者输血传播病毒 (TTV)的感染情况。方法　应用 Nested- PCR对 388例献血者、16 8例非肝炎住院患者进行 TTV DNA检测 ,同时用 EL ISA法检测抗 TTV Ig G。结果　 TTV基因检出率分别为献血组 15 .46 % ,对照组 2 4.40 % ;5 5 6例受检血清中 TTV DNA总的阳性检出率为 18.17% ,抗 TTV Ig G检出率分别为献血组 13.14% ,对照组 2 7.98% ;献血组与对照组相比 TTV DNA及抗 TTV Ig G均存在显著性差异 (P<0 .0 5 )。结论　献血者存在TTV感染 ,TTV存在健康携带状态。     

Prevalence of TT virus in serum and peripheral mononuclear cells from a CAPD population.

BACKGROUND: A novel virus named TT virus (TTV) has been isolated recently from patients with posttransfusional hepatitis of unknown etiology. The prevalence of TTV in several groups at risk has been reported, however, there is no information about the prevalence of TTV in patients on continuous ambulatory peritoneal dialysis (CAPD) without blood transfusions or hemodialysis antecedents. OBJECTIVE: To study the incidence of TTV in serum and peripheral blood mononuclear cells (PBMC) of CAPD patients. DESIGN: TTV DNA was detected by polymerase chain reaction, using primers from the open reading frames (ORF) 1 and 2, in serum and PBMC from 22 CAPD patients who had not received blood transfusions or hemodialysis therapy prior to CAPD. As controls, sera from 20 patients with chronic viral hepatitis (10 with HBV and 10 with HCV) and 20 healthy donors were included in the study. RESULTS: TTV DNA was detected in the serum of 5 of 22 (22.7%) CAPD patients with both sets of primers. Four of the 5 (80%) patients with TTV DNA in their serum were TTV positive in their PBMC with primers from ORF1 and ORF2. Five of 20 (25%) patients with chronic viral hepatitis (2 patients with HBV and 3 with HCV) and 4 of 20 (20%) healthy donors were TTV DNA positive in serum. No relation was found between TTV infection and the underlying kidney disease, previous surgery, and abnormal alanine aminotransferase levels. CONCLUSION: We have found a relatively high prevalence of TTV that is similar to that found in healthy donors and in patients with chronic viral hepatitis.     

Quantitative and genotypic analysis of TT virus infection in Chinese blood donors

BACKGROUND: The TT virus (TTV) is a member of a newly described family of human viruses related to the C ircoviridae viruses. Its association with specific diseases has not been established, and screening of blood donors has not been implemented. To date, 16 genotypes have been identified. STUDY DESIGN AND METHODS: Sera from 471 healthy blood donors (aged 11-58 years) were randomly selected and tested for TTV by the use of two sets of primers: NG59d/NG61d/NG63d primers and T801/T935 primers. Quantitative competitive PCR (QC-PCR) was developed to measure the TTV DNA concentration among the blood donors. Sequencing of a part of the genome was performed to identify the various genotypes. Several samples showed a mixed genotype infection. RESULTS: TTV was detected in 251 (53.3%) of 471 healthy Hong Kong blood donors by the use of NG59d/NG61d/NG63d primers. The prevalence of the virus increased steadily with age (p = 0.03). TTV DNA was detected in 90 percent (90 of a randomly selected 100) of samples by the use of T801/T935 primers. TTV DNA concentration was also measured by QC-PCR in the blood donors who were positive for TTV DNA in the first round of the heminested PCR. TTV titers ranged from 4.8 x 10(2) copies per mL to 6 x 10(4) copies per mL, with a median value of 1.2 x 10(4) copies per mL. Sequencing and phylogenetic analysis of a 223-bp fragment from open reading frame 1 showed three main genotypes (G1 [60.7%], G2 [24.3%], and G3 [14%]) and a new genotype 17 (G17), with the latter bearing 60-percent nucleotide homology with other genotypes deposited at GenBank. In addition, a new TTV subtype, G2f, was found. CONCLUSION: The prevalence of TTV is high in healthy Chinese blood donors. Three main genotypes (G1, G2, and G3) were detected. In addition, a new TTV genotype, tentatively designated as G17, and a new subtype, G2f, were identified.     

肝炎患者中TT病毒DNA及其IgG抗体的检测

目的：了解肝炎患中TTV的感染情况，方法：应用Nested-PCR对137份甲－庚型肝炎、31份非甲－庚型肝炎及104份献血员进行TTV DNA检测，同时用ELISA法检测抗TTVIgG。结果：TTV基因检出率分别为甲－庚型肝炎20．44％，非甲－庚型肝炎29．03％，献血员13．46％，抗TTVIgG检出率分别为甲－庚型肝炎27．74％，非甲－庚型肝炎35．48％，献血员14．42％；甲－庚型肝炎、非甲－庚型肝炎与献血组相比TTV DNA及抗TTV IgG均存在显性差异（P＜0．01）。结论：肝病中存在TTV感染，TTV存在健康携带状态。     

High prevalence of TT virus infection in French blood donors revealed by the use of three PCR systems

BACKGROUND: The purpose of this study was to determine the prevalence of TT virus (TTV) infection in voluntary blood donors in Southeastern France. STUDY DESIGN AND METHODS: The sera of 289 blood donors were tested for the presence of TTV DNA by two PCR systems detecting genes located in the 5' UTR (primer set A [Set A]) and the open reading frame (ORF2) (primer set B [Set B]) of the viral genome. A randomized sample of 40 blood donors was also tested by a nested-PCR system in the ORF1 by use of primer set C (Set C). Donors were questioned for possible risk factors for virus transmission. RESULTS: In the entire population studied, 30.8 percent of blood donors tested positive with both Sets A and B, and 70.6 percent with at least one set. In the sample tested with three sets of primers, 27.5 percent of blood donors were positive in testing with all PCR systems and 80 percent with at least one system. The specificity of TTV DNA amplification was confirmed by sequencing 10 PCR products obtained with each set of primers. Statistical analysis revealed that the prevalence of TTV reactivity increased with age. CONCLUSION: The high prevalence of TTV reactivity and the absence of a pathologic condition or risk factors obviously associated with the infection in blood donors suggest that there is no need for systematic detection of TTV infection before blood donation. Further studies are required to determine if TTV isolates can be responsible for a pathologic condition in humans after blood transfusion.     

献血者中TTV检测及新基因型鉴定

目的 :了解TTV在广东地区献血者人群中感染情况。方法 :应用半巢式PCR和克隆测序对南方医院输血中心 1998年初注册的献血者进行TTV感染调查和病毒基因序列分析。结果 :在 10 3名献血者中有 2 0名检测出TTV ,检出率为 19%。用自动测序仪测序得到的TTV序列片段 (1915～ 2 185核苷酸片段 )与通过互连网下载的基因TTV日本株比较 ,同源性在 6 6 8%～ 99.3%。结论 :我国献血者中存在较高的TTV感染率 ,所分离到的两毒株可能为国内一种新的TTV基因亚型 G2c型。