Foundations in Microbiology 9th Edition by Kathleen Park Talaro, Barry Chess

Exercise 1

Critical thinking is the ability to reason and solve problems using facts and concepts. These question can be approached from a number of angles, and in most cases, they do not have a single correct answer.
a. Explain the relationship between herd immunity and the development of influenzal pandemics.
b. Why will herd immunity be lacking if antigenic shift or drift occurs?