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

Exercise 1

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.
Explain why specimens should be taken aseptically, even when nonsterile sites are being sampled and selective media are to be used, and why speed is important in the clinical testing process.