Finding the missing millions: lessons from 10 active case finding interventions in high tuberculosis burden countries

### Summary box In 2019, 10.0 million people developed tuberculosis (TB) yet 2.9 million were not notified to National TB programmes (NTPs).1 This is largely due to limited accessibility to healthcare services, underdeveloped health reporting systems, insufficient human resources and poor linkages between private providers and national authorities.2 There are various global initiatives to address this challenge, including the Find.Treat.All #EndTB initiative and the End TB strategy which aims to reduce TB incidence by 90% between 2015 and 2035.3 To support innovative programmes, approaches and technologies aiming to increase the number of people detected with TB in low-and-middle income countries (LMICs), the TB REACH initiative was launched in 2010. It is led by the Stop TB Partnership …