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Case of Incidence of Pulmonary Tuberculosis

Case Scenario

The results of a study of the incidence of pulmonary tuberculosis in a village in India and given in the table below. All the persons in the village were examined during the surveys made 2 years apart, and the number of new cases was used to determine the incidence rate.

Category of Households at first survey Number of  persons Number of new cases


With culture positive case 500 10
Without culture positive case 10,000 10


What is the incidence of new cases per 1000 person years in households had a culture positive case during the first survey?


Incidence is the number of new cases of a disease occurring in a given time period.

Incidence rate = 10/(500 x 2) x 1000

Thus the incidence rate is 10 per 1000 person years.

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