1. Why are infections of the upper respiratory tract milder as compared to the infections of the lower respiratory tract?

2. Explain the difference between necrotizing ulcerative gingivitis and necrotizing ulcerative peridonitis.

3. Why is cranberry juice used to prevent urinary tract infections caused by E.Coli?

4. Explain the causes of pelvic inflammatory disease.

5. Explain the strategies devised by OSHA and the CDC to prevent transmission of blood-borne pathogens of infectious diseases.

6. Discuss the seven challenges created by the CDC.