How does each of the following conditions influence the prevalence of a disease

Question

How does each of the following conditions influence the prevalence of a disease in a population? For each scenario, assume that no other changes occur. Your choices are: increases prevalence, decreases prevalence, or has no effect on prevalence.

A treatment is developed that prolongs the life of people suffering from the disease

            Increase prevalence

A new measure is developed that prevents new cases of disease from occurring

            Decrease prevalence

There is immigration of a large number of healthy people into the population.

            Decrease prevalence

The case-fatality rate for the disease increases

            Decrease prevalence

Explanation / Answer

1. Increases. Assumption: # of new cases remains stable or increases due to lack of prevention

2. Decreases.Assumption: # of new cases don't come from other parts of country

3. Decreases. Assumption: # These healthy people don't have the disease

4.Decreases. People who have disease die, therefore, ratio of people who have the disease by total people increases, decreasing the prelevance.

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