Question

New Cases of Influenza	Entire Population per Age group for City A
1-21 years	202	180,000
22 – 49 years	1,462	250,000
50 – 65 years	1,296	250,000
66+ years	3,645	320,000
Total	6,605	1,000,000

What is the incidence of Influenza for City A?

		6.6 new cases per 1,000 people susceptible
		6.7 new cases per 1,000 people susceptible
		6.5 new cases per 1,000 people susceptible
		6.0 new cases per 1,000 people susceptible

Answer 1

Incidence rate of Influenza can be calculated by the following formula

Incidence of disease- Total no. of cases of people having influenza/ Total no of individuals in population.

Here, following data are given

Total no. of cases of people having influenza- 6605

Total no. of individuals- 1000000

So, incidence of Influenza in city A- 6605/1000000

So, incidence of Influenza in city A- 0.006605 per people

For, incidence of incidence of Influenza in city A per 1000 people- 0.006605×1000 = 6.605

So, Answer is A