Two Infectious Disease Epidemiologists Want to Investigate a New Laboratory

Multiple Choice

Two infectious disease epidemiologists want to investigate a new laboratory test that identifies tuberculosis (TB) infections.Dr.Merritt uses the standard test,which has a sensitivity of 80% and a specificity of 90%.Dr.Foundry uses the new laboratory test,which is 90% sensitive and 99% specific.In City A,it is known that 100 of 1,000 people have TB infections.What is the positive predictive value of the standard test in City A?

A) 10%
B) 47%
C) 53%
D) 80%
E) 90%