Population of a village on 1st June 2007 is 16,500. Since 1st January 2007, 22 new cases of TB were detected. Total registered cases were 220. What is the incidence of TB: (A) 133 per 100,000, (B) 121 per 100,000, (C) 111 per 100, 000, (D) 100 per 100,000
Answer is A. Incidence of TB: Is percentage of new cases (confirmed by bacteriological examination) per 1000 population Incidence of TB = New cases/ Total population x1000. In the given question : New cases of TB are 22, and total population is 16,500 This incidence of TB = 22/16500 x1000 = 1.33 per 1000 population Or incidence of TB = 133 per 100,000 population Ref: Park 25th edition Pgno : 189-190