侵袭性深部真菌病的实验室诊断ppt课件

1、侵袭性深部真菌病的实验室诊断倪语星上海交通大学医学院附属瑞金医院临床微生物科.侵袭性真菌病的致病菌条件致病菌 致病性双相真菌 念珠菌 组织胞浆菌曲霉 球孢子菌隐球菌 芽生菌接合菌 马内菲青霉镰刀菌 孢子丝菌暗色真菌酵母菌毛孢子菌枝顶孢霉.侵袭性真菌病(IFD)主要包括：念珠菌病隐球菌病侵袭性曲霉病.高危人群+高危要素=IFD.IFD的高危人群和高危要素广谱抗生素运用入住ICU血液系统肿瘤病人粒缺、骨髓移植器官移植HIV感染运用皮质激素糖尿病静脉插管.尸体解剖中侵袭性真菌感染的发生率78798081828384858687888990919202468Aspergillus spp.Candid

2、a spp.All otherPrevalence at Autopsy %Prevalence of invasive aspergillosis at necropsy at JW Geothe University Hospital,Frankfurt,Germany(Lancet ,2000;335:2076).54.84%12.9%3.23%9.68%19.35%国内西南医院尸解资料，(1971-2000)，郝飞教授提供AspergillusCryptococcusMucorCandidaAll others.侵袭性真菌病的流行病学特点危险要素不断增多，发生率逐年增高趋势，确切资料有

3、待搜集整理白念珠菌依然是最常见临床分别致病菌 非白念珠菌添加带来的问题曲霉已成为重要的致死真菌.真菌感染的实验诊断方法及问题形状学检查：阅历？阳性率？培育+鉴定：时间长，敏感性？血清学检查：敏感性？特异性？分子生物学检查：规范化？.真菌抗原、细胞壁成分检测GM实验：血浆、血清、BAL、胸水、CSF，用于曲霉检测；G实验: 用于曲霉、念珠菌检测，对隐球菌、接合菌无意义；乳胶凝集实验: 检测隐球菌；.新生隐球菌乳胶凝集实验.血清GM作为诊断的早期标志物Marr and Leisenring Clin Infect Dis 2005; 41:S381.在BAL中检测GM作为早期诊断标志Musher

4、et al. J Clin Microbiol 2004: 42(12): 5517-22敏感性 (%)特异性 (%)阳性预测 (%)阴性预测 (%)血清47937382BAL8510010088Becker et al. Br J Haematol 2003; 121: 448.关于GM实验与G实验可作为推定诊断的规范;GM: 检测半乳甘露聚糖，对曲霉感染诊断特异性强，假阳性反响可以在青霉菌属中出现；部分含青霉烷砜衍生物的抗菌药物可以诱发阳性反响；G实验: 检测(1,3)-D-葡聚糖，在很多真菌中都可以出现阳性反响，但在隐球菌、接合菌、毛霉、根霉呈阴性反响；.Prospective util

5、ity of (1-3)-B-D-Glucan (BG), galactomannan (GM) and anti-Candidaalbicans germ tube antibodies (CAGT) for the diagnosis of invasive fungal disease (IFD) in haemato-oncology adult patientsA. Alhambra1, M.S. Cutara2, J.M. Moreno1, A. Del Palcio Perez-Medel1, I. Moragues3, J.Pontn3, A. Del Palacio11Hos

6、pital Universitario Doce de Octubre, MADRID, Spain 2Hospital Universitario SeveroOchoa, LEGANES, Spain 3Universidad del Pais Vasco, BILBAO, Spain.Invasive Candidiasis S SP PPV NPVCAGT (%) 57 93 44 96BG (%) 77 86 39 97Invasive Aspergillosis S SP PPV NPVGM (%) 92 94 73 98BG (%) 57 84 42 91.CONCLUSIONS

7、 The incidence of IFD correlated directly and significantly (x2 p=0.0005) with risk stratification group: highest proportion in the high-risk group.Since all the biomarkers have inherent limitations, a better diagnosis yield is achieved combining the biomarkers. All three biomarkers share high negat

8、ive predictive value and can exclude reasonably IFD in haematology adult patients treated with wide spectrum antifungals.Evaluation of two serologic test for diagnosis invasive AspergillosisC. Castro, A. Romero, A. Aller, T. Gonzalez, A. Gonzlez, E. Martn-MazuelosH. U. Valme, SEVILLA, Spain.A total

9、of 236 sera from 51 patients in risk of IA were tested for GM using Platelia Aspergillus kit (Bio Rad, France) which 36 sera (10 patients) were tested for BG also using Fungitell kit (Associates of Cape Cod., USA). Patients were attended at the University Hospital of Valme from Seville from January

10、of 2021 to December 2021. Patients with GM index 0.5 in two consecutive samples have been marked as GM positive and samples with results 80pg/ml were marked as BG positive. All GM positive patients were classified according to EORTC/MSG criteria (2021) for probability of IA.GM testFrom 51 patient st

11、udied, 16 of them showed at least one positive specimen (33 sera). Only 6 patients showed two consecutive positive results (0.5 GM test) and they show clinical signs or microbiological criteria for AI proven (3 patients) and probable (3 patients). .BG assayThe BG assay were used in parallel with GM

12、in 36 sera which 26 showed positive result from 9 patients, (3 with AI proven and 6 AI probable). 3 patients showed positive results before for BG test ( 3,5 days) and 6 patients presented simultaneously both antigens. Never the GM test was the first serological test to show a positive result.G实验阳性的

13、9名患者中，G实验单独阳性的有3个病人，两种抗原同时阳性有6个病人，未出现单独GM实验阳性的情况。.ConclusionCalculating significant sensitivity for both detection methods was not feasible due to a low number of proven/probable AI. BG detection showed positive results before GM test and present the great advantage to be a “panfungalantigen. BG det

14、ection should be used with other techniques for detection of invasive Aspergillosis infections.真菌细胞壁构造表示图.深部真菌感染患者血浆1-3-D葡聚糖检测 病例选择 深部真菌感染患者35例，年 龄1288岁，来自我院2004年1月到5月住院患者，均经培育证明存在深部真菌感染，感染部位包括呼吸道、泌尿道、血液及静脉插管引起的系统性感染。正常安康对照组30人，来自我院安康查体者。第四军医大学 .检测结果正常对照组血浆1-3-D葡聚糖含量最高为7.29 pg/ml ，最低为0.45 pg/ml，平均值为

15、2.832.57pg/ml；深部真菌感染组血浆1-3-D葡聚糖含量最高为168.9 pg/ml，最低为14.93pg/ml，平均值为54.0636.13 pg/ml。经SPSS统计软件T-检验分析，对照组与深部真菌感染组1-3-D葡聚糖平均值差别非常显著t=7.741,P0.001。 .讨论入选的深部真菌感染患者均经细菌培育证明为念珠菌感染，包括白色念珠菌23株、热带念珠菌8株、季也蒙念珠菌1株、克柔念珠菌1株和光滑球拟假丝酵母菌2株，无隐球菌感染。如以10 pg/ml为cutoff值，那么阳性率为100%; 以20 pg/ml为cutoff值，那么阳性率为91.4。葡聚糖检测可在拟诊早期为临

16、床医生提供机体能否感染真菌的可靠信息，因此葡聚糖含量检测不失为一种适用的真菌感染早期诊断方法。.留意运用青霉素类加酶抑制剂香菇多糖等会引起假阳性！.PCRPCR技术用于诊断种特异-PCR非特异 PCR杂交Standart singlenestedPCR-EIAReal-time标本全血血浆血清BAL最低检测范围4-10 cfu/ml25-100 fg DNA原位杂交目的基因多拷贝基因.122 patients 323 samples 33 proven cases Time Axis of Methods for Detection of Pulmonary AspergillosisCT positive 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 chestX-rayantigen-glucan culturehis