Which of the following is not false about annual risk of TB
Incidence of TB infection (Annual infection rate, Annual risk of Infection ARI) : Percentage of population under study who will be newly infected (not diseased or cases) with TB among Non-infected in 1 year. Expresses attacking force of TB in community In developing countries 1% ARI corresponds to: 50 SS +ve cases per 100,000 general population Tuberculin conversion index is the "best indicator for evaluation of TB problem and its trend" in the community. Current ARI in India : 1.5% Ref: Park 25th edition Pgno : 190-191
ARI of 1% = 75 new cases
Current ARI in India is 1.7%
It is represents new cases of TB
It is assessed by tuberculin conversion in previously non-vaccinated children
Communicable diseases