The exercise problem the following information to figure prevalence and incidence rate:
Population of the city of Atlantis on March 30th, 2003 = 183,000.
Number of new cases of tuberculosis occurring between january 1st and June 30th, 1003 = 26
Number of active TB cases according to the city register on June 30th, 2003 = 264.
According to the definition, the prevalence rate = number of existing cases / population at risk.
As of June 30th, 2003, there are 264 TB cases.
therefore, the prevalence rate for TB is: 264 / 183,000 = 144 / ...
The solution explains how to calculate the prevalence rate and incidence rate.