Microbiology: A Systems Approach 4th Edition by Marjorie Kelly Cowan

Exercise 17

Critical thinking is the ability to reason and solve problems using facts and concepts. These questions can be approached from a number of angles and, in most cases, they do not have a single correct answer.
a. Explain which type of ELISA can be used to determine an individual's past exposure to a pathogen.
b. Discuss whether immunochromatographic assays are indirect or direct methods of testing.