Question

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Explanation:

Identify disease-causing organism definition

A disease-causing organism is biologically defined as a pathogen.

Identify host definition

A host is an organism (person or population) that contracts or harbors a pathogen.

Identify vehicle/vector definition

A biological or physical vehicle that carries and transmits an infectious agent to a host is defined as a vector.

Answer:

Question 1

• (A) vector
• (B) host
• (C) pathogen (Correct answer)
• (D) lymphoid

Question 2

• (A) Any vehicle that carries and transmits a pathogen
• (B) A person or population that contracts a pathogen (Correct answer)
• (C) An organism whose primary function is to fight disease
• (D) The intermediate reservoir in which a pathogen lives

Question 3

• (A) vector (Correct answer)
• (B) host