Fig. 3From: Yield of household contact investigation of patients with pulmonary tuberculosis in southern EthiopiaIncident Tuberculosis among Household Contacts to Index Cases Diagnosed between November 2010 and December 2011. Tuberculosis incidence was high in the first year and decreased during year two and beyond. In contrast to Fig. 2, tuberculosis incidence after year two continued to be low and the reason is that this analysis included higher proportion of household contacts that were followed for three or more years. But, note that even if TB incidence was lower for years two to four, it remained higher than that for the general populationBack to article page