Microbiology Fundamentals 2nd Edition by Jennifer Bunn,Marjorie Kelly Cowan

تمرين 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.
The normal biota of the GI tract seems to include a lot of disease-causing organisms. How can this be? That is, if they are normal, why are they also consider pathogens? If they are pathogens, why are they considered normal?