Post-tuberculosis morbidities and their associated mortality: moving from challenges to solutions

The case fatality of tuberculosis (TB) has progressively decreased since the use of antibiotics in anti-TB treatment, leaving 155 million TB survivors alive in 2020. Of the 122 million disability-adjusted life years (DALYs) due to TB in 2019, 58 million DALYs were attributed to the post-TB phase. TB causes massive lung structure damage, declined lung function and excessive inflammation, which persist even after microbiological cure and predispose to multiple lung diseases (<i>e.g.</i> COPD, chronic pulmonary aspergillosis, bronchiectasis and COVID-19). TB survivors also face a higher risk of cancers and cardiovascular diseases. These post-TB morbidities together with worse psychological and socioeconomic status lead to poor quality of life and a three- to four-fold higher mortality rate than the general population. Understanding the epidemiology of post-TB morbidities can help to set intervention and research priorities to lower public health burdens associated with post-TB morbidities. In this narrative review, we summarise what we know and do not know about the prevalence, risk factors and management of post-TB morbidities and their associated mortality. We identify the major post-TB morbidities based on current evidence. Delayed or incomplete TB treatment, residual lung structure damage and prolonged inflammation after TB treatment are important risk factors. Developing host-directed therapies to reduce lung structure damage, smoking cessation, implementing pulmonary rehabilitation to improve lung function and adopting well-tailored preventive strategies and screening protocols may improve the management of these post-TB morbidities and mortality and warrant future research.