How does herd immunity protect the nonimmune members of the population from acquiring a disease? Will herd immunity work for diseases that have a common source, such as water? Why or why not?
Answer to relevant QuestionsGive examples of host- to- host transmission of disease via direct contact. Also give examples of indirect host- to- host transmission of disease via vector agents and fomites. Identify the major risk factors for acquiring human immunodeficiency virus (HIV) infection in the United States. Does this pattern hold for other geographic regions? Why did the incidence of gonorrhea rise dramatically in the mid-1960s, while the incidence of syphilis actually decreased at the same time? Why are colds such common respiratory diseases and why are vaccines not used to prevent colds? Identify the animals most likely to carry rabies in the United States. Why is rabies so rare in humans and domesticated animals in developed countries?
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