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

Exercise 6

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. In May of 2010, the CDC began to notice a sudden increase in the number of salmonellosis cases reported that month. That trend continued until July 2010, when the number of cases began to slowly decline. Explain what type of epidemic these data represent, and why the number of cases finally went down after 3 months.
b. The above cases turned out to be linked to Salmonella contamination found at egg-producing facilities inIowa. Nearly 2,000 people became ill in multiple states. Explain how proper cooking of the eggs involved in thisoutbreak did not ensure elimination of the food-bornepathogen.