Question
A pathogen is: A. A micro-organism that doesn't cause infection B. A susceptible host C. The point of entry (portal of entry) D. A micro-organism that causes infection
Answer
4
(336 Votes)
Vincent
Master · Tutor for 5 years
Answer
D
Explanation
A pathogen refers to an agent, typically a microorganism, that causes disease or illness to its host. It is the primary driver of disease and can range from bacteria, viruses, prions, and fungi, amongst other things. Conversely, choices A, B, and C are all incorrect. Choice A indicates a micro-organism that does not cause an infection - the exact opposite of a pathogen. Choice B is referring to a host that holds the conditions for the pathogen to invade and infect. Lastly, choice C is referring to the pathway the pathogen takes to enter its host - but this pathway itself is not a pathogen.