ABSTRACT
Tuberculosis (TB) is one of the commonest communicable diseases in the world. The World Health Organisation (WHO) estimated that in 2014 approximately 10 million people developed TB and 1.5 million died from it (WHO, 2015a). Most of those affected live in low-income countries of Africa, Asia and South America. In several sub-Saharan African countries more than 1 in 200 people develop the disease each year. TB is second only to human immunodeficiency virus (HIV) as the world’s greatest killer from a single infectious agent (WHO, 2015b).
