Although the global incidence of tuberculosis (TB) has fallen by an average rate of 1.5% per year between the years 2000 and 2013, TB remains a major global health problem and is the second leading cause of death from infectious diseases [1,2]. An estimated 9 million people had developed TB in the year 2013 of which one-quarter was from Africa, the continent that also has the highest rates of cases and deaths relative to its population [1,3]. In the same year, only 5.7 million cases were both detected and notified to the National TB programs (NTPs), meaning that about 3 million people were "missed" by TB control programs [1]. The TB case detection rate (calculated as notifications of new and relapse cases divided by the estimated incidence per year) was only 64% at the global level and is below the World Health Organization (WHO) target (70%) [1].