Handbook of Disease Burdens and Quality of Life Measures pp 4145-4145 | Cite as
Annual Risk of Infection
The Annual Risk of Infection indicates what proportion of the population will be infected (whether primarily infected or reinfected) with, for example tubercle bacilli in the course of one year. It is usually expressed as a percentage or as a rate. For example, ARI that is available from a tuberculin survey has been utilized to estimate TB incidence through applying Styblo's rule: a 1% ARI was considered to be equivalent to a smear positive TB incidence of 50/100,000 (Styblo, 1985).