Texas Southern University - BIOL 347

Chapter 20

Epidemiology

True / False Questions

1)Generally, the smaller the infective dose, the lower the chance of disease.

2. A fly may serve as a mechanical vector.

3. The portal of entry typically has little effect on the course of a disease.

4. The very young and the elderly are more susceptible to infectious disease.
5. Diseases with long incubation periods are more likely to spread extensively.

6. A gradual rise in numbers during an epidemic indicates a common source epidemic.

7. Cross-sectional surveys are very useful in establishing cause of a disease.

8. A placebo is a mock drug.

9. In a double-blind test the treating physician knows who is getting the actual treatment.

10. Nosocomial infections are those acquired at a hospital.

11. Human population growth and expansion contribute to emergence of diseases.

Essay Questions

12. Why is nosocomial disease such a significant problem?