South Africa: Asymptomatic TB - a Hidden Challenge for TB Control
[UCT] Asymptomatic tuberculosis (TB) is common and biologically more complex than previously understood, with implications for treatment and care strategies. This is according to University of Cape Town (UCT) researchers, who have published new findings in Nature Communications that challenge current approaches to TB detection and control in South Africa.
A new study from the University of Cape Town (UCT) challenges existing knowledge on asymptomatic tuberculosis (TB) in South Africa. Asymptomatic TB is more complex than previously understood and current diagnostic tools struggle with detecting it in community settings. This poses a critical gap in TB control efforts.
Researchers identified two distinct subtypes of asymptomatic TB with different biological features and disease severity. The study found that many cases identified in national surveys are asymptomatic, with some community screening initiatives finding over 80% of people with TB are asymptomatic. The two subtypes showed differences in key markers of disease severity, with more severe cases having higher bacterial loads in sputum, chest radiographic abnormalities, and inflammatory profiles resembling symptomatic TB cases.
The milder asymptomatic group displayed features similar to early or long-term controlled infections.
This heterogeneity suggests that asymptomatic TB patients fall along a spectrum of disease progression, raising the possibility that different clinical management approaches may be needed for these two groups. Current blood-based biomarkers perform poorly when applied to asymptomatic TB screening, with 90% sensitivity but specificity below 50%.
The discovery of biomarkers that distinguish between asymptomatic TB subtypes could inform clinical decision-making about optimal treatment regimens. Future research should investigate whether these subtypes represent different prognoses, transmission risks, or treatment needs.
Written by urgent.news from AllAfrica Health's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
