3.Estimated Incidence and Prevalence of Tuberculosis

The WHO recommends in its annual report using one (or more than one) of the following formulas for calculation of incidence: (1) Incidence＝cases notifications／proportion of cases detected (2) Incidence＝prevalence／duration of condition (3) Incidence＝annual risk of infection × Sty'blo coefficient (4) Incidence＝deaths／proportion of incident cases that die