In the evolution of a new potentially pandemic strain of influenza A, the most significant ‘bottle-neck’ stage before a pandemic can develop is:

British investigators conducted a study to compare measles-mumps-rubella (MMR) vaccine history among 1,294 children with pervasive development disorder (e.g., autism and Asperger’s syndrome) and 4,469 children without such disorders: They found no association. This is an example of which specific type of study?

Select the correct statement concerning the selection of controls in a case-control study:

Life-course Epidemiology is an approach that allows for:

The main advantage of cost-utility analysis and the use of quality adjusted life years or QALYs, as a type of health economic analysis is that:

“A cohort study differs from a case-control study in that:” Which of the following is NOT TRUE:

For the cruise ship scenario described in Question 9, how would you display the time course of the outbreak? (Choose one best answer)

A question which IS NOT RELEVANT in descriptive epidemiology is

The fraction 50 ⁄ 54 is a/an:

In an evaluation of screening, specificity measures: