In poor, disadvantaged communities where overcrowding, undernutrition and HIV infection are common. Tuberculosis is a disease of poverty. Tuberculosis may be spread in any overcrowded spaces such as homes, schools, churches, buses, clinics and trains. TB infection is usually caught from a family member, friend or neighbour.
Tuberculosis is usually seen in poor communities.
About 95% of new TB cases and 99% of TB deaths worldwide are in developing countries. In developed countries TB is virtually confined to poor, overcrowded environments and ethnic minorities.