A. 100 per 100,000
B. 500 per 100,000
C. 1000 per 100,000
D. 5000 per 100,000

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Complete Question

There were 100 new cases of syphilis last year in a given population of 100,000 people. At that time, 500 people in this population already had syphilis. The incidence of syphilis in this population is .

a. 100 per 100,000

b. 500 per 100,000

c. 1000 per 100,000

d. 5000 per 100,000

a. 100 per 100,000

Explanation:

Incidence rate of a population can be defined as the rate at which an disease occurs in a population.

The incidence of a population is calculated as

The number of new cases ÷ The population of the people

From the above question,

The number of new cases = 100

The population of the people = 100,000

The incidence = 100 ÷ 100,000

The incidence of syphilis in the population is 100 per 100,000

answer: c.

explanation:

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