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1. Epidemiologists are interested in learning about ____________________ .

a) the causes of diseases and how to cure or control them
b) the frequency and geographic distribution of diseases
c) the causal relationships between diseases
d) all of the above

2. Diseases that are always present in a community, usually at a low, more or less constant, frequency are classified as having an ____________ pattern.

a) epidemic
b) endemic
c) pandemic

3. Which of the following statements is true concerning epidemic diseases?

a) They are usually not very contagious.
b) At the end of an epidemic, a disease spreads at an increasing rate and then abruptly disappears.
c) They usually appear and disappear seasonally.

4. An epidemic that becomes unusually widespread and even global in its reach is referred to as a _________________ .

a) pandemic
b) hyperendemic
c) Spanish flu

5. A disease vector is a(n) ____________________ .

a) organism that transmits a disease
b) symptom of a disease
c) environmental condition associated with a disease

6. Which of the following things cause malaria?

a) mosquitoes
b) plasmodia (singular plasmodium)
c) red blood cells

7. About what fraction of the people in the world have chronic diseases that are vector-borne?

a) 1/4
b) 1/2
c) 3/4

8. Most of the major health problems in the poorer nations are due to ____________________ .

a) parasitic worms and microorganisms
b) psychological tension resulting from work
c) air pollution

9. The prime cause of illness resulting in death in the poor countries of the tropical and subtropical regions today is __________________ .

a) lyme disease
b) plague
c) malaria

10. Diseases that are due mostly to environmental changes, increased population...
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