Diagnostic performance of the Pluslife MiniDock MTB and Molbio MTB Ultima assays to detect tuberculosis from tongue and sputum swabs among outpatients and in active case finding in Cameroon
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Background
Cost and infrastructure requirements limit access to current rapid molecular diagnostic testing for tuberculosis (TB). Recent developments in novel, swab-based assays that can be used closer to the point of care offer the potential to change the TB diagnostic landscape.
Methods
We assessed the diagnostic accuracy of two tests, Molbio Truenat MTB Ultima (MTB Ultima) and Pluslife MiniDock MTB Test (MiniDock MTB), among consecutively enrolled individuals aged 15 and above in health facilities and community-based screening events in Cameroon, compared to the reference standard of TB culture. Two tongue swabs and sputum specimens were requested from each participant. Comparator tests were smear microscopy and Xpert MTB/RIF Ultra.
Results
From February to June 2025, 1,097 participants were enrolled in communities (382) and at health facilities (715). Sensitivities of sputum and tongue swabs on MiniDock MTB among 132 people with culture-positive TB were 86% (95% CI, 79-91%) and 76% (95% CI, 68-82%), respectively, and 67% (95%CI, 51-79%) and 44% (95%CI, 29-59%) among those with smear-negative TB. Sensitivities of sputum and tongue swabs on MTB Ultima were 84% (97/116, 95%CI, 76-89%) and 74% (67/91, 95% CI, 64-82%), respectively, and 58% (95% CI, 41-74%) and 33% (95% CI, 18-53%) among those with smear-negative TB. Specificities of both tests were high (>97%).
Conclusions
In this population, the performance of both MiniDock MTB and MTB Ultima on tongue and sputum swabs was similar to target product profile thresholds for near point of care TB tests. Further studies to evaluate performance in diverse populations and settings are needed.
Summary
Our diagnostic accuracy study of new swab-based MiniDock MTB and MTB Ultima assays in Cameroon demonstrated accuracies similar to the tuberculosis detection target product profiles overall for near point of care tongue and sputum swabs.
