Imagine that you work for a state health department. Your supervisor has asked that you review vaccines for an upcoming training session for public health professionals. You will present this information in a professional report. For this report, you will select a vaccine-preventable disease or biological agent and describe the characteristics of a homeostatic system in both health and in a diseased state. Your report should include the pathophysiological impact on the body system affected in disease, how the disease functions in homeostasis, as well as a physiological explanation as to how the vaccine works.