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However, urinary assay for lipoarabinomannan, a 17.3-kDa immunogenic glycolipid component of the mycobacterial cell wall, offers some potential as a point-of-care TB test in HIV-infected patients.[2] It shows a moderate sensitivity of ?50% and a fairly high specificity of 83�C100%,[2, 36] and the sensitivity is higher among patients with cluster of differentiation 4 cell count [http://www.selleckchem.com/products/Dasatinib.html Dasatinib solubility dmso] failed recovery and/or [http://en.wikipedia.org/wiki/Oxygenase Oxygenase] low bacillary count. Inclusion of further investigation results and/or response to empirical treatment for these culture-negative patients may be useful to facilitate proper interpretation of the reported sensitivity and specificity. The 6-month short-course therapy was developed more than three decades ago through a series of randomized controlled trials.[38] Although the combined relapse and failure rate for this regimen is well below 5% under optimal trial conditions,[38-40] major challenges have been encountered in the fields, mainly related to the long duration of treatment and various socioeconomic constraints, resulting in poor adherence to treatment and loss to follow up, with further complication by human errors in prescribing inadequate regimens, inconsistent dosing and poor quality of drugs.[1] The standardized regimens often require modification in case of adverse events, especially among the elderly.[41] Longer duration of treatment is needed for cavitary lung disease with delayed culture conversion.[42] Intermittent regimens may be less efficacious than daily regimen,[43] and there [http://www.selleckchem.com/products/Gefitinib.html Selleck Gefitinib] is also risk of acquired rifampicin resistance among HIV-infected individuals.[44] Furthermore, early signs of successful control often kill the control programme by directing resources from it before eliminating TB.[45] Drug resistance haunted TB chemotherapy from the earliest days.[46] Combination therapy reduces such risk but does not eliminate it altogether.[47] TB control by treatment of infectious source cannot be sustainable if drug resistance emerges at faster pace than the decline in TB incidence. An effective backup mechanism is needed to handle cases with acquired drug resistance. Unfortunately, culture and drug susceptibility testing are not widely available in most high-burden areas, and the currently recommended retreatment regimen with addition of a single drug of streptomycin is likely to amplify drug resistance.