5. Which of the following statement(s) about incubation period (IP) is/are corre

Question

5. Which of the following statement(s) about incubation period (IP) is/are correct? (1 point)

A.    IP is the time interval between exposure to an infectious agent and the appearance of the first signs or symptoms of disease.

        B.    IP of different infectious agents could differ.

C.    Calculation of IP during outbreaks of foodborne illness helps to narrow down possible etiologic (infectious) agents.

D.    All of the above.

6.   It is assumed that diseases can be transmitted directly or indirectly. A vector such as a mosquito is an example of… (1 point)

Direct disease transmission

Indirect disease transmission

Person-to-Person exposure

Common vehicle exposure.

7.  The resistance of a population to an attack by a disease to which a large proportion of the members of the group are immune is referred to as… (1 point)

Group resistance

Population immunogenesis

Herd immunity

Lack of virulence of the agent.

8. The attack rate in susceptible people who have been exposed to a primary case is referred to as:

     (1 point)

The attack rate

The tertiary attack rate

The secondary attack rate

The person-to-person attack rate

Questions 9 and 10. Two surveys were done of the same community a year apart. Of 5,000 people surveyed the first time, 25 had antibodies to histoplasmosis. A year later, 35 had antibodies, including the original 25. Calculate the prevalence of people with histoplasmosis antibodies at the second survey, and the 1-year incidence. Remember to calculate the rate per 1,000 persons.

9. The prevalence of people with histoplasmosis antibodies at the second survey was…(1 point)

A.   2 per 1,000 persons

B.   5 per 1,000 persons

C.   7 per 1,000 persons

D. 12 per 1,000 persons.

10. The 1-year incidence rate was…(1 point)

A.   2 per 1,000 persons

B.   5 per 1,000 persons

C.   7 per 1,000 persons

D. 12 per 1,000 persons.

11. Which of the following statements portray the uses of disease surveillance? (1 point)

A.    Permits quick awareness of potential problem

B.    Allows for quick investigation of the problem and its control

C     Helps in the evaluation of control measures

D.    A and B only

E.    A, B, and C.

Explanation / Answer

5.

Correct answer:

D. All of the above

Explanation:

Incubation period varies with different infectious agents and their IP time can also indicate the type of agent that has caused the infection. It will further help in treatment process. IP is calculated as a time period between the infection and first development of symptoms.

Thus, all alternatives in a given question are correct.

Note: Pl. repost other unanswered questions to get their proper answers.

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