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Background Few tuberculosis (TB) control programmes in low-income countries have access to culture facilities in their primary care diagnostic centres and this scenario may have worsened with the coronavirus disease 2019 pandemic. Thus the aim was to develop and evaluate a simpler TB test that allows seeding on Löwenstein–Jensen (LJ) medium of several swab-embedded samples decontaminated with sodium hydroxide (NaOH). Methods A cotton swab containing each sample was decontaminated in NaOH before being dipped into a slightly acidic solution to neutralize the pH in order to allow the culture to develop on LJ medium. Samples (n=543) from suspected or confirmed pulmonary TB were analysed in two phases: standardization (n=167) and evaluation of the study method (n=376). Results The study method showed sensitivity &amp;gt;95% and specificity &amp;gt;93% using Ogawa–Kudoh (OK) and modified Petroff (MP) as standards and was comparable to MP-LJ (p&amp;gt;0.05) and slightly superior to OK (p=0.03) for sputum culture and more comprehensive than the latter for other pulmonary specimens. Conclusions This article reports a more comprehensive, simpler and less costly method for diagnosing TB in the laboratory with fewer economic resources and biosafety equipment. Thus a patent application was filed (BR1020190103841).

transactions of the royal society of tropical medicine and hygiene

Fast, simple and cheap: method modified from conventional cultivation for tuberculosis diagnosis allows seeding on Löwenstein–Jensen of any swab-embedded pulmonary samples decontaminated with sodium hydroxide