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Validation of an AI-Driven Sputum Analysis Platform for Accurate and Reliable Tuberculosis Detection in South-Western Uganda

Ziehl-Neelsen (ZN) sputum smear microscopy remains an accessible method for detecting acid-fast bacilli (AFB), but its interpretation is dependent on specimen quality and trained microscopy personnel. Artificial intelligence (AI) may provide a microscopy reading aid that supports consistent identification of AFB-positive and AFB-negative smear images. To evaluate transfer-learning deep learning models for classification of AFB-positive and AFB-negative digitized ZN-stained sputum smear images generated in a Ugan…

By the Truvace desk2 min read1 sourcePeer-reviewedTRV-2026-2125· cite & verify
Validation of an AI-Driven Sputum Analysis Platform for Accurate and Reliable Tuberculosis Detection in South-Western Uganda
"Mycobacterium leprae in Ziehl-Neelsen stained smear of sputum" by Ajay Kumar Chaurasiya is licensed under CC BY-SA 4.0. To view a copy of this license, visit https://creativecommons.org/licenses/by-sa/4.0/.

In brief

Researchers trained three pretrained deep learning models on 512 archived digitized Ziehl-Neelsen sputum smear images from Mbarara Regional Referral Hospital in south-western Uganda. The images were split evenly between AFB-positive and AFB-negative, and the models were tested on a held-out set of 77 images.

The result points to a possible way to support consistent smear reading where trained microscopy staff and specimen quality limit interpretation. Yet the evidence is early: the test set was small and from one centre, and the labels came from routine microscopy, so the system is not shown to be a stand-alone diagnostic tool.

Main points

  1. The dataset held 256 AFB-positive and 256 AFB-negative images, split into training (358), validation (77) and test (77) sets.
  2. Swin Transformer-Tiny reached ROC-AUC 0.9939 on the internal test set.
  3. DenseNet-121 reached 88.31% accuracy and ResNet-50 V2 reached 85.71% accuracy.
  4. The authors describe the platform as an AI-assisted reading aid, not an autonomous diagnostic.

The gain

A Swin Transformer-Tiny model separated AFB-positive from AFB-negative Ziehl-Neelsen smear images with 97.40% accuracy on an internal test set, suggesting a possible microscopy reading aid.

The rundown

The study was a retrospective, laboratory-based cross-sectional analysis. ResNet-50 V2, DenseNet-121 and Swin Transformer-Tiny were trained with ImageNet-pretrained weights in PyTorch, and performance was judged by sensitivity, specificity, accuracy, PPV, NPV, F1-score and ROC-AUC, with Wilson 95% confidence intervals for threshold-based metrics.

Swin Transformer-Tiny posted sensitivity of 97.37% and specificity of 97.44%, while DenseNet-121 had sensitivity of 84.21% and specificity of 92.31%. ResNet-50 V2 had sensitivity of 81.58% and specificity of 89.74%, so the transformer model led on every reported measure.

The authors call for prospective, multicentre evaluation with patient or specimen-level separation, independent microbiological reference standards and multiple blinded readers before any clinical deployment.

Sources

  1. Peer-reviewedMedical Devices: Evidence and Research2026-10-15

The debate