AT&T; LTE 1:15 AM Test 2.docx QUESTION 27 A new antibody test detects serum anti

Question

AT&T; LTE 1:15 AM Test 2.docx QUESTION 27 A new antibody test detects serum antibodies against v rus 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? a. Measurement error was introduced into the procedure. b Cases of virus X infection are more severe in the hospital C. Lead time bias occurs among the blood donors d. The prevalence of virus X infection is higher among the hospital patients than among blood donors 2.5 points QUESTION 28 A person with an inapparent infection a is of no epidemiologic importance b. never develops antibodies c. is a danger to family members but not to others in the community d. can transmit the infection to others 2.5 points QUESTION 29 You have just finished administering a food/drink questionnaire to ill and non-ill participants in a Minnesota summer picnic party. The ill individuals developed moderate to severe diarrhea 16 to 46 hours after the picnic. Six persons experienced vomiting. The following data were collected ATE DID NOT EAT Number of people Number of people

Explanation / Answer

Question 27 - Option D.

The prevalence of virus X infection is higher among the hospital patients than among blood donors.

Question 28 - Option D.

Can transmit infection to others.

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