CLINICAL EVALUATION OF FOUR RECOMBINANT TREPONEMA PALLIDUM ANTIGEN-BASED RAPID TESTS IN THE DIAGNOSIS OF SYPHILIS

Objective To assess the sensitivity,specificity,and feasibility of 4 recombinant Treponema pallidum antigen-based rapid tests in the diagnosis of syphilis.Methods A total of 970 outpatients were selected from the Sexually Transmitted Diseases Centre of Peking Union Medical College Hospital.Venous blood was collected and serum was extracted.T.pallidum antibodies in whole blood,anticoagulant whole blood,and serum were detected using 4 recombinant T.pallidum antigen-based rapid tests.T.pallidum haemagglutination test(TPHA) was considered as the gold standard for the detection of T.pallidum specific antibodies in serum.The sensitivities and specificities of four methods were analyzed.Results The sensitivities and specificities of Abbott Determine Syphilis TP test,SD-BIOLINE Syphilis 3.0 test,VISITECT-SYPHILIS test,and Syphicheck-WB test for serum specimens were 100% and 98.9%,95.7% and 98.0%,94.6% and 98.2%,68.1% and 98.9%;for whole blood were 74.1% and 99.5%,87.9% and 99.4%,73.2% and 99.7%,64.7% and 99.7%.The observed sensitivities of the 4 rapid diagnosis tests were not significantly different with TPHA(P>0.05).Conclusions The 4 rapid tests show good performance and characteristics in the diagnosis of syphilis.Furthermore,they are more sensitive for serum specimens than whole blood.

Construction of the Eukaryotic Expression Vector for Outer Membrane Protein Tp92 from Treponema pallidum and Its Preliminary Study on the Immune Responses in New Zealand Rabbits

To construct the recombinant plasmid of eukaryotic expression containing Tp92 gene from Treponema pallidum and study its immunogenicity in New Zealand white rabbits. Tp92 gene was amplified from the genomic DNA of T. pallidum by polymerase chain reaction (PCR) and subcloned into appropriate site of pcDNA3.1(+) vector. After identification by sequencing and restrictive enzyme digestion, the recombinant plasmid was transfected into HeLa cells using liposome, and the expressed protein was identified by immunocytochemistry and Western blotting. After verifying that the Tp92 antigen gene fragment could be expressed in HeLa cells, 100?μg of recombinant plasmids [pcDNA3.1(+)-Tp92], 100 μg of control plasmids [pcDNA3.1(+)] or 0.5 ml PBS buffer were administered in 3 groups of New Zealand white rabbits (6 rabbits/group), and the booster immunizations were employed at 2-week interval for 3 times. ELISA assay was used for the quantitative detection of the specific antibody in the sera of rabbits, and the proliferation response of spleen cells was detected by MTT assay. It was found that the target gene Tp92 segment about 2103 bp was obtained, and the DNA sequence of Tp92 gene constructed in pcDNA3.1 (+) vector was consistent with the published nucleotide sequence. The homologies of the nucleotide and putative amino acid sequences of Tp92 gene between T.pallidum subsp. pallidum Nichols and various pathogenic treponeme strains were 95.5%-100%. The analysis of immunocytochemistry and Western blotting showed that Tp92 gene segment constructed in pcDNA3.1(+) vector could express a fusion protein with a calculated molecular mass of 77 kDa in HeLa cells and the expressed protein could react with positive blood serum from syphilis patient. The specific antibody IgG titers were observed and the highest titer was 1∶1024 in rabbits after 3 times with pcDNA3.1(+)-Tp92. The proliferation response of spleen cells were significantly higher than that of rabbits injected with pcDNA3.1(+) ( P <0.05). The successful expression of the eukaryotic expression plasmid of Tp92 gene from T. pallidum was obtained in eukaryotic system and strong responses of humoral and cellular immunity was evoked by DNA vaccine of pcDNA3.1(+)-Tp92 in rabbits thus establishing a solid basis for the future studies in the biological activities and for the development of the syphilis DNA vaccine.

Expression and purification of the recombinant outermembrane protein Tp0453 of Treponema pallidum and its characterization of immuno-competence

To clone and express the recombinant outer membrane protein Tp0453 of Treponema pallidum and to analyze the immuno-reactivity and immunogenicity of the expressed protein, the immuno-dominant epitope of the Tp0453 was amplified from the complete genome of T.pallidum by PCR, subcloned into expression vector pQE32 to generate the recombinant plasmid pQE32/Tp0453, then expressed in E.coli M15 and analyzed by SDS/PAGE and Western blotting. The fusion protein expressed was purified with Ni-NTA affinity chromatography. Its immuno-reactivity was assayed by indirect ELISA, and the immunogenicity was determined by immunization with this fusion protein in New Zealand rabbits. In the present study, a fusion protein of molecular weight about 32 kDa was obtained. As demonstrated by Western blotting, the recombinant protein could react specifically with positive IgG sera of patients with syphilis, and the antibodies against T.pallidum in human sera were successfully detected by indirect ELISA. Both the sensitivity and specificity of ELISA based on the Tp0453 fusion protein as were 100% (30/30) when detected with control sera. In comparison with the results of IgG ELISA with those of TPPA. It was found that the sensitivity of ELISA was 96.8% and the specificity was 100%. The difference of ELISA and TPPA was not significant, and the concordance of results between ELISA and TPPA was 98.2%. In addition, specific humoral responses could be elicited by immunization with the recombinant fusion protein in New Zealand rabbits with a specific antibody titer of 1∶1280 after 3 successive doses of immunization. These results demonstrate that the expressed recombinant fusion protein shows excellent immuno-competence and provide foundation to develop a quick diagnostic kid applied to detect the presence of T.pallidum infections.

Eukaryotic expression of outer membrane protein Gpd from Treponema pallidum and preliminary studies on its immune response in rabbits

The Gpd gene was amplified from the genomic DNA of Treponema pallidum and cloned into the appropriate site of pcDNA3.1(+) vector. The expression of pcDNA3.1(+)-Gpd in HeLa cells was tested with Western blotting and technology of immunocytochemistry. New Zealand rabbits were immunized with the eukaryotic expression recombinant pcDNA3.1(+)-Gpd. A fusion protein of Gpd with 4.1 kDa has been effectively expressed in HeLa cells, which were detected by Western blotting and the immunocytochemistry techniques. The New Zealand rabbits were able to elicit the specific antibody after immunization with the nucleic acid vaccine. The antibody titer could reach as high as 1∶1024 after 2 weeks of the third injection; and the splenocytes proliferated evidently due to the Gpd protein stimulation. Both the antibody titer and the splenocytes proliferation were higher substantially than those of controls (P<0.01). All above data will contribute to an experimental basis of further study of the biological function of Gpd protein as well as DNA vaccine for syphilis.

Cloning and Expression of the Tpp17 Gene of Treponema pallidum And Clinical Application

Objective: To obtain recombinant Treponema pallidum subsp, pallidum (TP 17KD) lipoprotein in large quantities by amplification and to further purify antigens for laboratory diagnosis of syphilis and development of a syphilis vaccine. Method: The Tppl7 lipoprotein gene was amplified from the TP(strain Nichols), and then it was recombinated into a plasmid pMAL-2c and cloned within E. coli 12-TB1. The host bacteria containing recombinant plasmids were induced with IPTG. The Tpp 17KD lipoprotein gene was amplified by us-ing PCR and positive clones were screened with double digestion and PCR. Recombinant plasmids were transformed into E. coli and the E. coli carrying recombinant plasmids were induced. The expression of TP 17KD was detected by sodium dedecyl sulfate-polyacrylamide gel electrophoresis(SDS-PAGE) and immunoblot. Results:Gel staining with Coomassie blue G-250 showed that the induced E. coli carrying recombinant plasmid could produce 60KD fusion protein at high levels. Gel scanning showed that 17KD protein expression in E. coli accounted for 10 % of total cellular protein. The recombinant protein antigen reacted with the sera of syphilis patients. Conclusion: Our study lays a cornerstone for developing new techniques of laboratory diagnosis for syphilis and new vaccines. Preliminary clinical application showed that the fusion protein could be used for the diagnosis of syphilis.

The Construction of the Eukaryotic Expression Vector of Glycerophosphodiester Phosphodiesterase Gene from Treponema pallidum and its Expression in Hela Cells

Objective: To construct the recombinant plasmid containing Glycerophosphodiester phosphodiesterase (Gpd) gene from Treponema pallidum and transfect it into Hela cells to express the encoded outer membrane protein. Methods: The Gpd gene was amplified from the genomic DNA of T.pallidum by polymerase chain reaction (PCR) and inserted into cloning vector pUCm-T. The inserted Gpd gene was subcloned into the appropriate site of pcDNA3.1(+) vector. After identification by sequencing and restrictive enzymes digestion, the recombinant plasmid was transfected into Hela cells using liposomes. The expressed protein was identified by immunocytochemistry and Western blot. Results: The target Gpd gene segment was approximately 1059bp. The DNA sequence of the Gpd gene contained in the pcDNA3.1(+) vector was consistent with the published nucleotide sequence. The homology of the nucleotide and putative amino acid sequences of the Gpd gene between T. pallidum subsp. pallidum Nichols and various pathogenic treponemal strains ranged from 98% to 100%. Immunocytochemistry and Western blot analysis showed that the constructed Gpd-pcDNA3.1(+) vector expressed a fusion protein with a calculated molecular mass of 41KDa in Hela cells and that the expressed protein reacted with the sera from syphilis patients. Conclusion: The successful construction and expression of the eukaryotic expression plasmid of the Gpd gene from T.pallidum provide a promising tool to further study the biological activity of T.pallidum and develop a DNA vaccine for syphilis.

Detection of Treponema pallidum,Herpes Simplex Virus,and Haemophilus ducreyi from Genital Ulcers by Multiples Polymerase Chain Reaction

Objective: To evaluate the clinical application of multiplex PCR in the detection of Treponema pallidum, Herpes simplex virus (HSV), and Haemophilus ducreyi. Method: Three standard strains were used to set up a multiplex PCR (MPCR) for detecting syphilis, herpes genitalis, and chancroid simultaneously. Samples from 122 patients with genital ulcer disease(GUD) were subjected to MPCR and the results were compared with these of dark-fidd microscopy and TP serology, HSV anligen ELISA,and H. ducreyi culture, Result: In the 122 patients with GUD, MPCR identified 34 casesof T.pallidum infection, 40 cases of HSV infection, and 2 cases of mixed infection of T.pallidum and herpes. No positive results of H. ducreyi were found. The sensitivity of MPCR to T. pallidum and herpes was 100% and 93.3%, respectivdy. The sensitivities of dark-field microscopy and TP serology, HSV antigen ELISA, and H. ducreyi culture was 35.3%, 50% and 100%, respectively. Conclusion: MPCR showed a relatively higher sensitivity for T.pallidum as compared with the routine techniques. Although its sensitivity for HSV was not as good as that of antigen ELISA, it also yielde da high detection rate. MPCR can detect more than one pathogen. It is simple, quick, sensitive, and suitable for clinical use or epidemiological investigation.

Treponema pallidum-specific antibody expression for the diagnosis of different stages of syphilis

Background Tp15, Tp17, Tp45, and Tp47 are outer-membrane proteins found in Treponema pallidum, the etiologic agent of syphilis. These proteins are potent antigens and are potential markers for the serological detection of syphilis. The present study analyzed antibodies to these protein antigens （TP-IgM and TP-IgG） in human serum and investigated the expression of these antibodies during different stages of syphilis. Methods Serum samples were collected from 69 subjects （male 45, female 24） diagnosed with syphilis and analyzed by Western blotting for the expression of IgM and IgG against the four protein antigens. Expression levels of the target antibodies were compared during the same stage of syphilis as well as between different stages of this disease. Results In subjects with primary syphilis, the positive rate of Tp45 IgM was higher than that of other TP-IgM. Tp15 IgM was detected only in subjects with tertiary syphilis. Similarly, the seroprevalence of Tp45 IgG in primary syphilis was higher than for other TP-IgG. No target TP-IgM was detected in subjects with latent syphilis. In subjects with secondary syphilis, the expression level of Tp15 IgG （138.73±20.16） was higher than for other target TP-IgG. In subjects with tertiary syphilis, all target TP-IgG were detected. In subjects with tertiary or latent syphilis, the expression levels of Tp45 IgG （121.33±11.04 and 110.10±40.19, respectively） were higher than those of other target TP-IgG. The expression levels of all Tp-lgM were similar before or after anti-syphilis treatment. In comparison, the expression levels of all TP-IgG decreased compared with the pre-treatment levels, and this decrease was statistically significant （both P 〈0.05） for Tp17 IgG and Tp47 IgG. Conclusions After Treponema pallidum infection, Tp45 IgM appeared first and Tp15 IgM occurred during later stages. The positive rates of all TP-IgG increased with the duration of this disease. Anti-syphilis treatment reduced the expression levels of Tp17 IgG and Tp47 IgG. Larger-scale studies are required to further validate the value of Tp15, Tp17, Tp45, and Tp47 as markers for the early detection of primary and latent syphilis.

Seroreactivity and immunogenicity of Tp0965, a hypothetical membrane protein of Treponema pallidum

Background Treponema pallidum （T. pallidum） subsp, pallidum is the causative agent of syphilis. Analysis of recombinant antigens of T. pallidum led to the identification of potential candidate antigens for vaccine development and syphilis serodiagnosis. Tp0965 was predicted to be a membrane fusion protein and was found to be reactive with infected human sera in previous studies, but the results were controversial. In this research, the antigenicity and immunoreactivity of recombinant protein Tp0965 were assessed. Methods T. pallidum subsp, pallidum （Nichols strain） was propagated and isolated and the genomic DNA was extracted. The Tp0965 gene was amplified by polymerase chain reaction （PCR）. Then the recombinant protein Tp0965 was expressed in Escherichia coli and purified by nickel-nitrilotriacetic acid （Ni-NTA） purification system. The reactivities of protein Tp0965 were examined by immunoblot analysis and indirect enzyme-linked immunosorbent assay. The antisera against protein Tp0965 were obtained by immune rabbits and the immunogenicity of antisera were detected by indirect enzyme-linked immunosorbent assay. Results Recombinant protein Tp0965 was expressed successfully in vitro. Immunoblot assay showed that the recombinant protein Tp0965 could be recognized by human syphilitic sera of all stages. Indirect enzyme-linked immunosorbent assay showed there were only 4 of 74 human syphilitic sera that failed to show reactivity to recombinant antigen Tp0965, and lack of reactivity of Tp0965 to all 28 uninfected sera. A low titer of antiserum against Tp0965 in immune rabbits could be detected after the third time of immunization. Conclusions The recombinant antigen Tp0965 shows excellent sensitivity for the reactivity with sera from syphilitic individuals at all stages. The results also demonstrate a potential application for the serodiagnosis of syphilis.

Production of proinflammatory cytokines in the human THP-1 monocyte cell line following induction by Tp0751,a recombinant protein of Treponema pallidum

The tissue destruction characteristic of syphilis infection may be caused by inflammation due to Treponema pallidum and the ensuing immune responses to the pathogen.T.pallidum membrane proteins are thought to be potent inducers of inflammation during the early stages of infection.However,the actual membrane proteins that induce inflammatory cytokine production are not known,nor are the molecular mechanisms responsible for triggering and sustaining the inflammatory cascades.In the present study,Tp0751 recombinant protein from T.pallidum was found to induce the production of proinflammatory cytokines,including TNF-α,IL-1βand IL-6,in a THP-1 human monocyte cell line.The signal transduction pathways involved in the production of these cytokines were then further investigated.No inhibition of TNF-a,IL-1β,or IL-6 production was observed following treatment with the SAPK/JNK specific inhibitor SP600125 or with an ERK inhibitor PD98059.By contrast,anti-TLR2 mAb,anti-CD14 mAb,and the p38 inhibitor SB203580 significantly inhibited the production of all three cytokines.In addition,pyrrolidine dithiocarbamate (PDTC),a specific inhibitor of NF-κB,profoundly inhibited the production of these cytokines.Tp0751 treatment strongly activated NF-κB,as revealed by Western blotting.However,NF-κB translocation was significantly inhibited by treatment with PDTC.These results indicated that TLR2,CD14,MAPKs/p38,and NF-κB might be implicated in the inflammatory reaction caused by T.pallidum infection.

抗-TP阳性献血者中抗病毒治疗药物使用情况分析

目的了解深圳市梅毒螺旋体(TP)抗体(抗-TP)阳性献血者中抗逆转录病毒治疗(ART)药物使用情况,评估人类免疫缺陷病毒(HIV)诊疗新趋势带来的血液安全风险。方法采用分层随机抽样方法选取2019年3月至2023年1月深圳地区血液筛查合格的重复献血者60例(阴性对照组),规律服用已知ART药物人群3例(阳性对照组),抗-TP阳性/抗-HIV阴性献血者353例(实验1组),抗-TP阳性/抗-HIV阳性献血者25例(实验2组),应用高效液相色谱-串联质谱(HPLC-MS/MS)方法检测各组血浆样本中8种ART药物浓度,分析ART药物使用情况。结果阳性对照组血浆采用1∶6稀释混样后ART药物仍可检出,实验1组和实验2组1∶6人份混合血浆阳性样本经拆分确证,实验2组检出1例ART药物阳性样本,该样本抗-HIV、蛋白免疫印迹、HIV RNA阳性,抗TP阳性献血者ART药物检出率为0.26%,实验1组ART药物检出率为0.00%,实验2组ART药物检出率为4.00%。结论深圳地区抗-TP阳性献血者中发现使用ART药物情况,合并HIV感染及高危性行为人群更可能使用ART药物。

Infectious Disease Update in Obstetrics: A Modern Approach to the Patient with a Positive Screening Test for Syphyilis in Pregnancy

Screening for maternal syphilis has been an essential component of routine antenatal screening tests in most countries for many years. This is not only because of the virulence of the spirochete which causes the infection but also because of its vertical transmission rate and the potential severe adverse complications/morbidity that can result from its transmission to the fetus. Although the incidence of maternal syphilis and its fetal sequalae in low-income countries has been considerable for several years, the disease has been almost non-existent in high income countries with wide antenatal screening coverage and effective treatment programmes for Syphilis. The recent alarming increase in the incidence of maternal syphilis in high income countries has spawned a renewed public health interest in the infection, with several countries updating and strengthening public health guidance in an attempt to stem this dramatic trend. This is a short clinical update for the practising obstetrician on how to manage the antenatal patient with a positive syphilis screening test.

2018-2022年北京市密云区医院孕产妇人类免疫缺陷病毒、梅毒螺旋体、乙型肝炎病毒检测结果分析

目的:分析2018-2022年北京市密云区医院孕产妇人类免疫缺陷病毒(HIV)、梅毒螺旋体、乙型肝炎病毒(HBV)检测结果。方法:选取2018年1月-2022年12月于密云区医院进行孕产期保健及分娩的孕产妇19 327例作为研究对象,收集并分析孕产妇一般资料及HIV、梅毒螺旋体和HBV初筛结果。结果:19 327例孕产妇中,HIV阳性0例,梅毒螺旋体阳性101例(0.52%),HBV阳性175例(0.91%)。2018-2022年梅毒螺旋体和HBV阳性呈小幅度波动,其中以2021年明显降低。孕产妇梅毒螺旋体、HBV阳性率及构成比均以20~29岁最高,40~45岁最低。结论:2018-2022年北京市密云区医院孕产妇HIV、梅毒螺旋体、HBV阳性率较低,以20~29岁最多,临床应针对此情况采取应对措施,消除艾滋病、梅毒、乙型肝炎的母婴传播。

CLIA、RPR、TPPA检测血清中梅毒螺旋体抗体的价值分析

目的 分析化学发光免疫测定法(CLIA)、快速血清反应素试验(RPR)、梅毒螺旋体明胶颗粒凝集试验(TPPA)检测血清中梅毒螺旋体抗体的结果。方法 100例疑似梅毒患者血清样本为研究对象,均采用CLIA、RPR、TPPA进行检测,并以重组免疫印迹法(RIBA)检测结果为金标准,分析三种检测方式的检测结果 ,并比较三种检测方式的诊断效能。结果 CLIA检出阳性59例,阴性41例。RPR检出阳性73例,阴性27例。TPPA检出阳性59例,阴性41例。CLIA诊断准确率为69.00%(69/100),敏感度为68.92%(51/74),特异度为69.23%(18/26);RPR诊断准确率为97.00%(97/100),敏感度为97.30%(72/74),特异度为96.15%(25/26);TPPA诊断准确率为77.00%(77/100),敏感度为74.32%(55/74),特异度为84.62%(22/26)。RPR的诊断准确率、敏感度显著高于CLIA、TPPA(P<0.05);RPR的特异度高于CLIA(P<0.05);CLIA与TPPA的诊断准确率、敏感度、特异度差异较小(P>0.05)。结论 RPR在梅毒螺旋体抗体的临床诊断中具有更佳的诊断准确率,可为梅毒患者的治疗提供可靠的诊疗依据。

2014—2023年HIV/AIDS患者与梅毒螺旋体共感染的文献计量学与可视化分析

目的通过对近10年HIV/AIDS患者与梅毒螺旋体共感染的相关报道文献的可视化分析,了解该领域的研究热点和未来趋势。方法以Web of Science Core Collection数据库作为数据源,检索2014-2023年HIV/AIDS患者合并感染梅毒螺旋体的相关文献,使用VOSviewer和CiteSpace对相关文献进行可视化分析。结果共有81个国家,1171家机构进行了相关研究,其中美国、中国、英国研究者发文较多,且合作紧密,发达国家是研究主力。关键词聚类中流行病学、孕妇、产前护理、神经梅毒、眼梅毒、男男性行为人群等反映了研究热点,其中男男性行为人群、眼梅毒是未来研究趋势。结论近10年HIV/AIDS患者合并梅毒螺旋体感染的研究热点从合并感染的流行病学、对神经梅毒的诊断逐渐转变至对眼梅毒及男男性行为人群的关注。

梅毒螺旋体与母胎界面细胞相互作用影响妊娠结局的机制研究进展

梅毒是由梅毒螺旋体(Treponema pallidum,Tp)感染引起的一种慢性、性传播疾病[1]。近十年来,梅毒在世界范围内流行,特别是在非洲、东南亚、西欧、俄罗斯和中国,并在这些地区造成了严重的公共卫生问题[2-3]。梅毒发病率逐年上升,先天性梅毒(con-genital syphilis,CS)发生率也一直处于较高水平[4-5]。CS是由Tp经胎盘垂直传播感染胎儿的一种先天感染性疾病,可发生于妊娠任何阶段.

梅毒螺旋体外膜蛋白功能的研究进展

梅毒是一种严重影响人类健康的慢性传播性疾病,是由梅毒螺旋体感染所引起。梅毒螺旋体外膜蛋白(Omp)是一类具有关键性功能的蛋白。Omp在梅毒螺旋体的免疫原性、黏附宿主细胞以及转运营养物质等方面具有非常重要的作用。本文就梅毒螺旋体主要外膜蛋白的结构、功能等特性做一综述。

梅毒携带者并发神经梅毒的危险因素分析

目的 探讨梅毒携带者并发神经梅毒的危险因素。方法选择2016年2月—2023年6月仪征市人民医院神经内科收治的64例梅毒携带者,其中并发神经梅毒者33例为研究对象。针对快速血浆反应素试验(rapid plasma reagin test,RPR)持续阳性时间、RPR滴度、脑脊液梅毒螺旋体颗粒凝集试验(treponema pallidum particle agglutination assay,TPPA)结果、脑脊液白蛋白水平、合并人类免疫缺陷病毒(human immunodeficiency virus,HIV)感染、脑脊液白细胞计数、颅内压、是否接受正规梅毒治疗等进行单因素及多因素logistic回归分析。结果 RPR持续阳性时间1年以上,RPR滴度≥1∶8,脑脊液TPPA结果阳性,脑脊液白细胞计数升高为梅毒携带者并发神经梅毒的独立危险因素(P <0.05),接受正规梅毒治疗为预防梅毒携带者并发神经梅毒的保护因素(P<0.05)。结论 对于梅毒RPR试验持续阳性时间超过1年且滴度≥1∶8,脑脊液TPPA结果阳性合并脑脊液白细胞计数升高者,其发生神经梅毒的概率显著增高,故此类患者应更为积极地接受规律治疗。

两种梅毒抗体检测方法在梅毒早期诊断中的应用

目的分析梅毒早期诊断中两种梅毒抗体检测方法的应用效果。方法从梅毒螺旋体明胶颗粒凝集试验为阳性患者中选择117例,另选择健康体检者113例,所有研究对象均接受梅毒螺旋体明胶颗粒凝集试验和甲苯胺红不加热血清试验进行检验,以梅毒螺旋体明胶颗粒凝集试验结果为金标准,分析甲苯胺红不加热血清试验的检查结果及诊断敏感性和特异性。结果梅毒螺旋体明胶颗粒凝集试验检出阳性117例,阴性113例。以梅毒螺旋体明胶颗粒凝集试验结果为金标准,甲苯胺红不加热血清试验检出阳性患者99例、占比43.04%,阴性患者131例、占比56.96%,诊断敏感性、特异性分别为84.62%(99/117)和100.00%(113/113)。结论梅毒传染性较强,对身体危害大,因此需尽早筛查尽早治疗,避免延误治疗时机。梅毒螺旋体明胶颗粒凝集试验灵敏性较高,可以提升诊断质量,减少误诊,但该检测方式费用更高,操作较为复杂,因此在实际检测过程中可以使用甲苯胺红不加热血清试验进行筛查,联合两种检测方式效果更优。

酶联免疫吸附试验与甲苯胺红不加热血清试验在梅毒螺旋体感染诊断中的效能比较

目的:比较酶联免疫吸附试验(ELISA)与甲苯胺红不加热血清试验(TRUST)检测在梅毒螺旋体感染诊断中的效能。方法:选取2021年6月至2022年6月于该中心进行传染病检测的100例疑似梅毒螺旋体感染患者为研究对象,采集患者血液标本,均进行ELISA、TRUST和梅毒螺旋体明胶凝集试验检测,以梅毒螺旋体明胶凝集试验检测结果为金标准,比较ELISA与TRUST检测在梅毒螺旋体感染诊断中的效能。结果:100例疑似梅毒螺旋体感染患者梅毒螺旋体明胶凝集试验检测阳性63例,阴性37例;ELISA检测阳性62例,阴性38例;TRUST检测阳性56例,阴性44例;ELISA检测诊断梅毒螺旋体感染的灵敏度、准确度、阴性预测值均高于TRUST检测,漏诊率低于TRUST检测,差异有统计学意义(P<0.05)。结论:ELISA检测在梅毒螺旋体感染诊断中的效能高于TRUST检测。