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1. Which of the following epidemiologic theories focuses on the interaction between the host, agent, and environment in disease
development?
A. Chain of infection theory
B. Germ theory
C. Web of causation theory
D. Social determinants theory
Answer: C. Web of causation theory
Rationale: The web of causation theory emphasizes the complexity of disease development and the interplay between multiple factors.
2. According to the concept of the epidemiologic triad, which of the following is NOT considered a component of disease causation?
A. Host
B. Environment
C. Pathogen
D. Treatment
Answer: D. Treatment
Rationale: The epidemiologic triad focuses on the host, agent, and environment as the key components of disease causation.
3. Which epidemiologic model describes the spread of disease through a population by examining the interconnectedness of
individuals?
A. Agent-host-environment model
B. Deterministic model
C. Social network model
D. Ecological model
Answer: C. Social network model
Rationale: The social network model looks at how individuals are connected to each other and how disease can spread through these
networks.
4. Which of the following is a key assumption of the chain of infection theory?
A. Disease transmission is always predictable.
B. All diseases have a single specific cause.
C. Individuals are always susceptible to infection.
D. The environment plays a minimal role in disease development.
Answer: B. All diseases have a single specific cause.
Rationale: The chain of infection theory assumes that each disease has a specific chain of events leading to its development.
5. The concept of herd immunity is based on which epidemiologic theory?
A. Germ theory
B. Ecological theory
C. Threshold theory
D. Social determinants theory
Answer: C. Threshold theory
Rationale: Herd immunity is a concept based on the threshold theory, which suggests that a certain percentage of the population must be
immune to a disease to prevent its spread
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