HSC 404 FINAL QUIZZES | QUESTIONS AND ANSWERS |
2026 UPDATE | 100% CORRECT
Sensitivity and specificity of a screening test refer to its: Answer - validity
The degree of agreement among several trained experts refers to: Answer -
inter-judge reliability
A test that determines whether disease is actually present is a Answer -
diagnostic test
A new antibody test detects serum antibodies against virus X (sensitivity 99%,
specificity 90%). When applied in a group of hospitalized patients diagnosed as
having virus X infections, the test is found to have a positive predictive value of
85%. When used to screen a group of healthy blood donors for virus X
infections, the test is found to have a positive predictive value of 30%. Which of
the following best explains this difference between the positive predictive
values? Answer - The prevalence of virus X infection is higher among the
hospital patients than among blood donors
1. The conditions favorable to population screening for pre-symptomatic
diagnosis
of a given disease include:
i. a relatively high prevalence of the disease.
ii. availability of effective treatment.
, iii. a screening test with a high degree of sensitivity.
iv. availability of physicians to perform the screening test procedure.
Which of the above statements are correct? Answer - i., ii., and iii. only
A person with an inapparent infection... Answer - can transmit the infection to
others
The Centers for Disease Control and Prevention published an article concerning
the high rate of foot fungal disease in New Orleans. The article explains that
there has been a high rate of foot fungal disease in New Orleans for decades.
Foot fungal disease in New Orleans is best described as: Answer - endemic
The public health officer from Long Beach complains to you about the dreaded
Pacific Pox. The health officer says, "If people catch the Pox, they suddenly get
the urge to dance in the sand and fall dead on the beach within the hour."
There are no survivors to interview so you deduce: Answer - the case fatality
rate of the Pox must be high
What factors comprise the epidemiologic triangle? Answer - agent, host,
environmental (all of the above)
Someone suggests immunization as a means of reducing disease, specifically
the feared UJ (uderlinger jacamoodi). What part of the disease cycle is he or
she trying to affect? Answer - host
With respect to a hypothetical rabies investigation conducted among veterinary
workers (Dr. Spot, 2003), researchers found that rabies was almost always fatal.
This finding refers to: Answer - virulence
the site where a disease agent enters the body is the: Answer - portal of entry
2026 UPDATE | 100% CORRECT
Sensitivity and specificity of a screening test refer to its: Answer - validity
The degree of agreement among several trained experts refers to: Answer -
inter-judge reliability
A test that determines whether disease is actually present is a Answer -
diagnostic test
A new antibody test detects serum antibodies against virus X (sensitivity 99%,
specificity 90%). When applied in a group of hospitalized patients diagnosed as
having virus X infections, the test is found to have a positive predictive value of
85%. When used to screen a group of healthy blood donors for virus X
infections, the test is found to have a positive predictive value of 30%. Which of
the following best explains this difference between the positive predictive
values? Answer - The prevalence of virus X infection is higher among the
hospital patients than among blood donors
1. The conditions favorable to population screening for pre-symptomatic
diagnosis
of a given disease include:
i. a relatively high prevalence of the disease.
ii. availability of effective treatment.
, iii. a screening test with a high degree of sensitivity.
iv. availability of physicians to perform the screening test procedure.
Which of the above statements are correct? Answer - i., ii., and iii. only
A person with an inapparent infection... Answer - can transmit the infection to
others
The Centers for Disease Control and Prevention published an article concerning
the high rate of foot fungal disease in New Orleans. The article explains that
there has been a high rate of foot fungal disease in New Orleans for decades.
Foot fungal disease in New Orleans is best described as: Answer - endemic
The public health officer from Long Beach complains to you about the dreaded
Pacific Pox. The health officer says, "If people catch the Pox, they suddenly get
the urge to dance in the sand and fall dead on the beach within the hour."
There are no survivors to interview so you deduce: Answer - the case fatality
rate of the Pox must be high
What factors comprise the epidemiologic triangle? Answer - agent, host,
environmental (all of the above)
Someone suggests immunization as a means of reducing disease, specifically
the feared UJ (uderlinger jacamoodi). What part of the disease cycle is he or
she trying to affect? Answer - host
With respect to a hypothetical rabies investigation conducted among veterinary
workers (Dr. Spot, 2003), researchers found that rabies was almost always fatal.
This finding refers to: Answer - virulence
the site where a disease agent enters the body is the: Answer - portal of entry
