Question 1

Consider the following: the common cold and the Ebola virus.
Which is/are pathogenic?

Accepted Answer

Both are

Question 2

In Question 5, which disease is more virulent?

Accepted Answer

Ebola virus

Question 3

Infectivity is:

Accepted Answer

A)  the amount of pathogen required to produce an infection. 
B)  the ability of a pathogen to produce an infection. 
C)  only caused by viruses. 
D)  the same as infertility. B

Question 4

Virulence is:

Accepted Answer

A)  the degree of damage caused by a microorganism to a host. 
B)  a term only used in the context of viral infection. 
C)  applied only to human infections. 
D)  the same as pathogenicity.

Question 5

Which of the following is true in terms of the number of patients involved?

Accepted Answer

A)  outbreak > pandemic > epidemic 
B)  outbreak = pandemic = epidemic 
C)  epidemic > pandemic > outbreak 
D)  pandemic > epidemic > outbreak

Question 6

Prevalence takes into account only new cases in a population during a given period of time.

Accepted Answer

A) True 
 B)False

Question 7

The incubation period is:

Accepted Answer

A)  the time during which an individual displays the signs and symptoms of an infectious illness. 
B)  the time between exposure to the pathogen and appearance of signs and symptoms in an individual. 
C)  the time it takes to culture an organism in the laboratory. 
D)  the time it takes between first contact with a diseased individual for a second susceptible individual to display signs and symptoms.

Question 8

The incubation period is:

Accepted Answer

A)  the interval between the point of infection and clinical disease. 
B)  always the same as the latency period. 
C)  how long it takes to culture the organism in the laboratory. 
D)  how long it takes the population of organisms to double.

Question 9

Which of the following could normally be considered chronic infections? Choose all that apply.

Accepted Answer

A)  Strep throat 
B)  AIDS 
C)  Meningitis 
D)  COPD

Question 10

Which one of the following is the best possible definition of sensitivity?

Accepted Answer

A)  The number of those individuals for whom a test result is positive divided by the total number of individuals in a sample which the gold standard test has given a positive result 
B)  How well a test selects those who have the disease 
C)  The number of positives in the sample divided by the total number of participants 
D)  How well a test selects those who do not have the disease

Question 11

Incidence takes into account only existing cases in a population during a given period of time.

Accepted Answer

A) True 
 B)False

Question 12

Pathogenicity:

Accepted Answer

A)  refers to the degree of harm caused by an organism to a host. 
B)  requires laboratory tests to verify its presence. 
C)  the ability of an organism to cause a disease (or not). 
D)  the same as virulence.

Question 13

A latency period is defined as:

Accepted Answer

A)  the interval between exposure and clinical signs. 
B)  how long an organism remains in the body. 
C)  the interval between exposure and infectiousness. 
D)  the period during which the organism is not infectious.

Question 14

A definition of specificity is:

Accepted Answer

A)  The proportion of true negatives indicated by the test result divided by the total number of negatives indicated by the gold standard test 
B)  The probability of finding a negative in the general population 
C)  How well a test selects a condition 
D)  A diagnostic test that diagnoses a condition

Exam 2: Basics of Infectious Disease Epidemiology

Consider the following: the common cold and the Ebola virus. Which is/are pathogenic?

In Question 5, which disease is more virulent?

Infectivity is:

Virulence is:

Which of the following is true in terms of the number of patients involved?

Prevalence takes into account only new cases in a population during a given period of time.

The incubation period is:

The incubation period is:

Which of the following could normally be considered chronic infections? Choose all that apply.

Which one of the following is the best possible definition of sensitivity?

Incidence takes into account only existing cases in a population during a given period of time.

Pathogenicity:

A latency period is defined as:

A definition of specificity is: