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

Exercise 11

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 Sabin oral polio vaccine (OPV) is currently used in India and other developing countries around the world. Conduct additional research and discuss whether this method of immunization has been safe and effective.