There have been calls to revisit the experiences of TB screening campaigns that were widely applied in Europe and North America in the mid-20th century as well as more recent experiences with TB screening in countries with a high burden of the disease and to assess their possible relevance for TB care and prevention in the 21st century. In response WHO has developed guidelines on screening for active TB. An extensive review of the evidence has been undertaken. The review suggests that screening if done in the right way and targeting the right people may reduce suffering and death but the revie