Table 1.

Diagnostic classification according to the revised WHO case definitions.

Bacteriologically confirmed TB	- Detection of AFB by microscopy of secretions or;- Identification of M. tuberculosis by culture or;- Identification of M. tuberculosis by Xpert.
Clinically diagnosed TB*	- does not fulfil criteria for bacteriological confirmation but; - Suggestive appearances on chest X-ray and; - Favourable response to specific antituberculous therapy. +/- Positive tuberculin skin test +/-Suggestive histological appearances on biopsy material.

^⁎Clinically diagnosed TB cases had symptoms and signs suggestive of TB, did not fulfil the criteria for bacteriological confirmation of disease, had suggestive appearance on chest X-ray and failed to respond to empirical broad-spectrum antibiotics. Favourable response to antituberculous therapy was an integral part of the clinical TB diagnosis.