A patient is transferred to a nursing home without arrangements for follow-up being discussed with the family or a clinician responsible for follow-up care.  This is an example of the failure of the

Vaccination not only keeps the individual from contracting a disease but also makes it harder for the pathogen to find a susceptible host.

5% of the US population under the age fo 65 is uninsured.

A major deterrent in smoking cessation are the addictive effects of nicotine and withdrawal.

Epidemiologic studies of chronic disease are more complicated and difficult than infectious diseases.

Motor vehicles are not the main cause of air pollution.  Factories are. 

The EPA has set standards for 87 identified contaminants in the Safe Drinking Water Act to ensure potable water.

You are searching for a website that provides additional informatoin on disease progression in multiple sclerosis.  You click on a link and wind up at a site for a health spa that claims to cure everything from polio to the common cold.  Which of the key quality standards for website evaluation does this violate?

Treatment of contact patients is called epidemiological treatment.

If a drug company is testing the efficacy of a new drug, all subjects involved in the study, including the controls, must not be taking another drug at the time.