What are the factors that affect STD prevalence

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. What are the links in the “Chain of Infection” for STD? 2. What are the factors that affect STD prevalence? 3. What are the examples of Primary, Secondary and Tertiary preventions to deal with STD? 4. Why do we get the “flu shot” yearly? 5. Why do people who get a vaccine sometimes feel the same symptoms as someone with the actual disease?

How do quality practices that originated in the manufacturing industry differ from the traditional quality practices of health care organizations