Infection controlQuestion 1119 of 1700

In the chain of infection, what is an infectious agent?

  1. The place where germs live and grow
  2. The route germs take to enter a body
  3. A germ that causes infectious disease
  4. A person who is at risk of infection
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Correct answer: A germ that causes infectious disease

The agent is the microorganism itself. The other choices describe other links in the chain.

Source: Nursing Assistant (Reuter), 4.2: Chain of Infection

Practice infection control

Questions last reviewed: 18 October 2026