WHO operational handbook on tuberculosis: module 1: prevention: tuberculosis preventive treatment

WHO operational handbook on tuberculosis: module 1: prevention: tuberculosis preventive treatment

About one fourth of the world’s population is estimated to be infected with the tuberculosis (TB) bacterium, and about 5–10% of those infected develop active TB disease in their lifetime. The risk for active TB disease after infection depends on several factors, the most important being the person’s immunological status.