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

Exercise 46

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.
Summarize the clinical stages of syphilis. Suggest reasons for the observed increase in the number of syphilis cases identified in recent years in the United States and abroad.