Which of the following is not true about Annual Infection rate of tuberculosis ?
Ans. is 'a' i.e., 1% increase in AIR is equivalent to 70 new cases of TB Annual Infection Rate (also known as Tuberculin conversion index) o AIR is the % of population under study who will be newly infected by M. tuberculosis amongst the noninfected of the preceeding survey during the course of one year. o It reflects the annual risk of being infected (or reinfected) in a given community. o In other words, it expresses the attacking force of TB in a community. o It is considered one of the best indicator to evaluvate the TB problem and its trend. o In developing countries, every I% of of annual risk of infection is said to correspond to 50 new cases of smear positive pulmonary TB, per year for 1,00,000 general population. o The higher the rate the greater the problem. o Good treatment programme lowers the risk of TB infection in the community.
1% increase in AIR is equivalent to 70 new cases of TB
It is one of the best indicator for evaluating tuberculosis problem and its trend
It expresses attacking force of Tuberculosis in community
It is 1.7 % in India