Question

Suppose the population of Friendly Town on September, 2014 is 45,000. The number of new active cases of gonorrhea for May 1st through September 30th is 34 and the number of active cases on September 30th of gonorrhea is 234. The prevalence rate was:

		76 per 100,000 population
		520 per 100,000 population
		596 per 100,000 population
		7.6 per 100,000 population
		52 per 100,000 population

Suppose the population of Friendly Town on September, 2014 is 45,000. The number of new active cases of gonorrhea for May 1st through September 30th is 34 and the number of active cases on September 30th of gonorrhea is 234. The incidence rate of active cases of gonorrhea for the 5-month period was:

		520 per 100,000 population
		596 per 100,000 population
		7.6 per 100,000 population
		76 per 100,000 population
		52 per 100,000 population

Assume a population of 1,000 people of when 15 are sick with a certain disease, 12 of the 15 die from this disease.

Calculate the case-fatality rate from the disease.

Answer 1

(1)

We know that,

The prevalence rate = (No. of Cases) / (Population Size)

Thus, The prevalence rate = 234 / 45000

= (234*100000) / 45000  per 100,000 population

= 520 per 100,000 population

(2)

We know that,

The incidence rate = (No. of active cases) / (Population Size - time @ risk)

Thus, The incidence rate = 234 / (45000 - 200)

= (234*100000) / (45000- 200) per 100,000 population

= 76 per 100,000 population

(3)

We know that

The case-fatality rate from the disease = (No. of deaths)*100 / (No. of cases) %   

= (12*100) / 15 %

= 80%