BACTEC 9050自动血培养仪的临床应用

目的 评价BACTEC 9050自动血培养仪的临床应用情况。方法 分析2年来自动血培养仪检测的阳性率、阳性报警时间、菌种鉴定及临床分析。结果 检测2424份血培养标本，分离出328株菌，总阳性率为13．5％（328／2424），其中革兰阴性菌167株（50．91％，167／328），阳性菌112株（34、15％，112／328），真菌49株（14．94％，49／328）。分离率居前三位的细菌是大肠埃希菌（22．86％），金黄色葡萄球菌和肺炎克雷白菌（10．36％），白色念珠菌（7、32％）。在全部328例阳性瓶中，24h阳性报告率为51．36％，48及72h阳性率分别为78．5％、92．3％。结论 BACTEC 9050自动血培养仪对肠杆菌、葡萄球菌及真菌具有较好的检测能力。     

Comparative evaluation of BACTEC 460TB system and Lowenstein-Jensen medium for the isolation of M. tuberculosis from cerebrospinal fluid samples of tuberculous meningitis patients

PURPOSE: To evaluate the role of the radiometric BACTEC 460TB system and the conventional Lowenstein-Jensen (LJ) medium for isolation of M. tuberculosis from cerebrospinal fluid (CSF) samples of tuberculous meningitis (TBM) patients. METHODS: CSF specimens (n=2325) from suspected TBM patients were processed for isolation of mycobacteria by inoculating BACTEC 12B medium and the LJ medium. The isolation of mycobacteria in both media was confirmed by microscopy and biochemical identification. Drug sensitivity testing for the anti-TB drugs was carried out by BACTEC radiometric method. RESULTS: Among the total 2325 CSF specimens processed by both methods, M. tuberculosis was isolated from 256 specimens. The isolation rates were 93% and 39% for the BACTEC system and LJ medium respectively. Both the media supported growth in 32% of the culture-positive specimens. BACTEC system alone yielded growth in 61% and LJ alone in 7%, of the culture-positive specimens. Among 205 isolates tested for drug susceptibility 81% were sensitive to all the drugs tested and 19% were resistant. CONCLUSIONS: The BACTEC 460TB system provides a highly sensitive and rapid tool for the isolation and drug susceptibility testing of M. tuberculosis, from CSF of TBM patients. Use of a solid medium in conjunction with the BACTEC 12B medium is essential for optimal recovery for M. tuberculosis from CSF specimens.     

BACTEC MGIT 960仪在肺结核病诊断中的应用

[目的]探讨BACTEC MGIT 960仪在肺结核病诊断中的应用。[方法]应用BACTEC MGIT 960仪对肺结核病人的痰标本进行培养，并与BACTEC TB 460仪、改良罗氏培养法及涂片抗酸染色法进行对照。[结果]BACTEC MGIT 960仪阳性率为31．96％，与BACTEC TB 460仪的阳性率接近，比改良罗氏培养法及涂片抗酸染色法高。[结论]BACTEC MGIT 960仪能显著缩短（初代阳性平均分离时间为11．6d，比BACTEC TB 460仪快1．9d，比改良罗氏培养法快9．1d。）报告时间，且阳性检出率高。     

两种需氧血培养系统对模拟菌血症检测能力的比较

目的比较BACTEC PLUS树脂需氧瓶与BacT／Alert FA活性炭需氧瓶对模拟菌血症的检测能力。方法选择烧伤科常用的抗生素与细菌病原体，将菌液、抗生素、新鲜无菌血注入各培养瓶内，记录5d内阳性瓶的检出时间及二者对万古霉素的吸附能力，对2种具有不同吸附剂的血培养瓶的阳性检出率及平均检出时间进行比较。结果除替考拉宁组外，BACTEC PLUS树脂需氧瓶的细菌阳性检出率和平均检出时间均优于BacT／Alert FA活性炭需氧瓶，差异有统计学意义（P〈0．001）；替考拉宁组BacT／Alert FA活性炭需氧瓶的细菌阳性检出率和平均检出时间优于BACTEC PLUS树脂需氧瓶。结论在进行血培养时，应该尽可能在抗生素使用以前或F次使用抗生素以前采血。对已经应用抗生素的患者，应选择具有中和、吸附抗生素能力的培养系统。     

用多通道串联式压电生物传感仪快速检测临床病原菌

目的:通过本室研制的多通道串联式压电石英传感装置(MSPQC),快速检测病人血液及体液中致病菌。方法:将含血液标本的检测池放入MSPQC及BACTEC9120血培养仪检测,再转种血平板验证,比较两种仪器的检测结果。结果:培养时间为5天时,MSPQC的阳性检出率是18.92%(650例中123例阳性结果),而BACTEC9120的阳性检出率是19.38%(650例中126例阳性结果);MSPQC有2例假阳性和2例假阴性结果,BACTEC9120有3例假阳性和0例假阴性结果。结论:对于大多数革兰阳性菌和革兰阴性菌MSPQC的检出时间比BACTEC9120快。MSPQC有很好的临床应用前景。     

BACTEC MGIT^TM960全自动分枝杆菌培养鉴定／药敏仪基本原理及其应用

BACTEC MGIT^TM960全自动分枝杆菌培养鉴定／药敏仪，能大大缩短分枝杆菌的检测时间，该仪器自动化程度高，无放射性污染，可进行药敏学动态研究。     

Isolation of mycobacteria by BACTEC 460 TB system from clinical specimens

This article reports our experience with the BACTEC 460 TB system in the past five years and its performance characteristics and its advantages over the conventional LJ medium for mycobacterial culture. Clinical specimens (3597) from patients suspected to have tuberculosis were submitted for mycobacterial culture between May 2000 and August 2005 and were processed using the BACTEC 460 TB system. Pulmonary samples were 1568 while the extra pulmonary samples were 2029. BACTEC achieved detection of 681 (18.93%) M. tuberculosis cases (499- pulmonary, 182- extrapulmonary) with a recovery time shorter by 13.2 days compared to conventional method, while 577 (84.7%) were non-tuberculosis mycobacteria. Automated systems can have a great impact and thrust on an early diagnosis of tuberculosis allowing an early and appropriate management of the patient and thereby a better disease outcome.     

Immunochromatographic assays for detection of Mycobacterium tuberculosis: what is the perfect time to test?

In this study, we aimed to correlate the analytical performance of SD BIOLINE TB Ag MPT64 Rapid Test kit (MPT64 assay) with the mycobacterial growth unit (GU) reported by the BACTEC MGIT 960 (MGIT 960) instrument. A total of 394 culture isolates reported positive by MGIT 960 were processed daily (until ‘day 4’) with the MPT64 assay until a positive MPT64 result was obtained and their GU values were noted daily before MPT64 testing. Based on this correlation of MPT64 positivity and corresponding GU values, a GU cut-off was determined. In the validation phase, with the experimentally determined GU cut-off value, 99.1% (576/581) of culture isolates were correctly identified as MTB within 2 days from instrument positivity. All results were available using a single-MPT64 assay strip, making the assay cost-effective. Thus, systematic implementation of the MPT64 assay proved to be cost-effective in a high-throughput laboratory without any delay in patient reporting.     

MGIT 960和比例法对结核分枝杆菌药物敏感性试验的对比研究

目的评价BACTEC MGIT960检测8种抗结核药物耐药性的效果。方法用MGIT960对结核杆分枝杆菌临床分离菌株进行抗结核药物异烟肼、利福平、链霉素、乙胺丁醇、卷曲霉素、卡那霉素、氧氟沙星和乙硫异烟胺的药敏检测,并将结果与L-J比例法结果进行比较分析。结果用MGIT960法与L-J比例法对118株结核分枝杆菌临床分离株进行异烟肼、利福平、链霉素、乙胺丁醇、卷曲霉素、卡那霉素、氧氟沙星、乙硫异烟胺的耐药性检测,两种方法的符合率分别为97.5%(115/118)、92.4%(109/118)、96.6%(114/118)、84.7%(100/118)、94.9%(112/118)、94.1%(111/118)、97.5%(115/118)、85.6%(101/118)。MGIT960完成一线/二线药物药敏试验的时间平均为8.9和8.3天,L-J法则分别为26.7天和26.1天,差异有统计学意义(P<0.01)。结论 MGIT960所得的药敏结果与传统比例法有较高的一致性,但检测时间较短,有利于耐药结核病人的早期诊断和治疗。     

BACTEC MGIT 960系统在分枝杆菌属菌种初步鉴定及药敏中的应用

目的评价BACTEC MGIT 960系统在分枝杆菌属菌种鉴定及药敏中的应用价值。方法显微镜观察BACTEC MGIT 960系统分离的162株分枝杆菌在液体培养基中的形态,传统生化和核酸检测法同时鉴定分枝杆菌属菌种,分析细菌形态与菌种之间的关系;应用BACTEC MGIT 960系统对分离的141株结核分枝杆菌进行药敏试验。结果 162株分枝杆菌属在MGIT液体培养基中呈索条状、分枝状、点粒状和分散状4种形态;呈索条状132株分枝杆菌属均为结核分枝杆菌,呈点粒状10株和分散状6株分枝杆菌属均为非结核分枝杆菌;对链霉素、异烟肼、利福平和乙胺丁醇的耐药率分别为9.9%、14.2%、9.2%和6.4%,总耐药率18.4%,同时耐利福平和异烟肼的为8.5%;药敏平均检测时间为9.3 d。结论 BACTEC MGIT 960系统可快速将分枝杆菌属初步鉴定为结核分枝杆菌和非结核分枝杆菌,能快速准确获得临床一线抗结核药物的药敏结果。