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
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
