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首页> 外文期刊>Journal of Clinical Microbiology >Algorithm for use of nucleic acid probes for identifying Mycobacterium tuberculosis from BACTEC 12B bottles.
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Algorithm for use of nucleic acid probes for identifying Mycobacterium tuberculosis from BACTEC 12B bottles.

机译:使用核酸探针从BACTEC 12B瓶中鉴定结核分枝杆菌的算法。

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Nucleic acid probes (Gen-Probe, San Diego, Calif.) can be used to identify mycobacteria in BACTEC 12B broth cultures prior to detection of growth on solid media. We developed an algorithm that can be used to make an initial choice of a probe (either Mycobacterium tuberculosis complex [MTB] or M. avium complex [MAC]) for use in testing respiratory specimens. The algorithm was based on both the fluorochrome smear result of the concentrated specimen and the time from inoculation until the BACTEC 12B broth culture is flagged (growth index 10) as presumptively positive. The MTB probe is used first for all 4+ smear specimens, 3+ smear specimens positive in 5 days, 2+ and 1+ smear specimens positive in 7 days, and smear-negative specimens positive in 11 days. The MAC probe is used for all other specimens. The algorithm is used when other information about the culture (e.g., previous positive cultures and colonial morphology of growth on solid media) is unknown. Use of the algorithm to probe 102 respiratory BACTEC 12B broth cultures (35 with MTB; 1 with MTB, MAC, and M. gordonae; 47 with MAC; and 19 with other mycobacterial species) from 1 September through 30 November 1992 resulted in the initial use of the MTB probe for 35 (97%) of the cultures positive for MTB and the use of the MAC probe for 35 (73%) of the cultures positive for MAC. Use of the algorithm aided in the efficient use of laboratory resources without delaying the time to identification of MTB isolates.
机译:核酸探针(Gen-Probe,圣地亚哥,加利福尼亚)可用于在固体培养基上检测生长之前鉴定BACTEC 12B肉汤培养物中的分枝杆菌。我们开发了一种算法,可用于初步选择用于测试呼吸道标本的探针(结核分枝杆菌复合物[MTB]或鸟分枝杆菌复合物[MAC])。该算法基于浓缩样本的荧光染料涂片结果以及从接种到BACTEC 12B肉汤培养物标记为(生长指数10)假定为阳性的时间。首先将MTB探针用于所有4+个涂片样本,5天呈阳性的3+涂片样本,7天呈阳性的2+和1+涂片样本,以及11天呈阳性的涂片阴性样本。 MAC探针可用于所有其他样品。当关于培养物的其他信息(例如,先前的阳性培养物和固体培养基上生长的菌落形态)未知时,使用该算法。使用该算法探测1992年9月1日至11月30日期间的102种呼吸BACTEC 12B肉汤培养物(35种MTB; 1种MTB,MAC和戈登分支杆菌; 47种MAC; 19种其他分枝杆菌种)使用MTB探针检测MTB阳性的培养物中的35个(97%),使用MAC探针检测MAC阳性的培养物中的35个(73%)。该算法的使用有助于实验室资源的有效利用,而不会延迟鉴定MTB分离物的时间。

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