8) If a population contains 800 individuals and documents 400 cases of measles within the population, what is the prevalence rate?

7) Why are numerical measures of epidemiological data useful?

31) While not a hard-and-fast rule, molecules may be ranked from more immunogenic to less immunogenic. Which shows the correct ranking form more immunogenic to less immunogenic?  

6) What are the three factors of the epidemiological triangle?

4) What is the order of the five stages of infectious disease?

27) Why are leukocytes so central to second-line molecular defenses?

26) Which cell type is a lymphocyte that is abundant in the liver, and has important roles in innate immune protection against viruses, bacteria, parasites, and even tumor cells?

36) Which is not a step in the process of B cell activation by a T-dependent antigen?   

34) What is the role of memory cells?  

21) Which of the following features are shared between both innate and adaptive immunity?