$$R_0$$ = \text{expected secondary transmissions from one case in a susceptible population}$$

Question 1

Which of the following best describes the difference between incidence and prevalence of a disease?

Accepted Answer

Incidence is the number of new cases in a given period, while prevalence is the total number of new and existing cases at a given time.

Question 2

A disease that is constantly present in a population, usually at low incidences, is referred to as:

Accepted Answer

Endemic

Question 3

Which of the following is an example of a common-source epidemic?

Accepted Answer

Cholera outbreak due to contaminated water

Question 4

What is the primary goal of disease surveillance in epidemiology?

Accepted Answer

To observe, recognize, and report diseases as they occur

Question 5

Which equation correctly represents the basic reproduction number ($$R_0) in $$epidemiology?

Accepted Answer

$$R_0$$ = 	ext{expected secondary transmissions from one case in a susceptible population}$$

Question 6

Which of the following is NOT a mode of infectious disease transmission?

Accepted Answer

Genetic inheritance from parents

Question 7

A well-adapted pathogen that lives in balance with its host typically causes which type of infection?

Accepted Answer

Chronic infection

Question 8

Why does herd immunity protect a population from infection?

Accepted Answer

Because a high proportion of immune individuals blocks transmission chains

Question 9

Which of the following is an example of a zoonosis?

Accepted Answer

Rabies transmitted from animals to humans

Question 10

What is the most effective public health measure for controlling cholera pandemics?

Accepted Answer

Application of water treatment and purification

Question 11

Which of the following statements about carriers is TRUE?

Accepted Answer

Carriers may show no or mild symptoms but can still transmit the pathogen.

Question 12

Which public health strategy is best described as restricting the movement of individuals exposed to an infectious person?

Accepted Answer

Quarantine

Question 13

A sudden increase in the number of cases of a disease that was previously under control is referred to as:

Accepted Answer

Reemerging disease

Question 14

Which factor does NOT contribute to the emergence of infectious diseases?

Accepted Answer

Universal vaccination coverage

Question 15

In the context of epidemiology, what does the term 'mortality' refer to?

Accepted Answer

The incidence of death in a population

Question 16

Which of the following is a correct application of the concept of coevolution between host and pathogen?

Accepted Answer

Host resistance increases and pathogen virulence diminishes over time.

Question 17

Which of the following is a nonliving reservoir for infectious disease?

Accepted Answer

Soil

Question 18

Which of the following best explains why control of a zoonotic disease in humans may not eliminate the disease as a public health problem?

Accepted Answer

The disease can persist in animal reservoirs and re-infect humans.

Question 19

Which of the following is a key element in addressing emerging infectious diseases?

Accepted Answer

Prompt recognition of the disease and intervention to prevent transmission

Question 20

Which of the following best describes a host-to-host epidemic curve?

Accepted Answer

A slow, progressive rise and gradual decline in cases

30. Principles of Epidemiology: Microbiology Study Notes

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