Which of the following statements about the relationship between hosts and microbes is true?
A)An opportunistic pathogen has a relatively low infectious dose.
B)Infection always leads to symptoms.
C)Some organisms can be pathogens and commensals.
D)Endogenous infections are caused by microbes that are endemic to the environment.

Question

Quizplus · Accepted Answer

Some organisms, such as Staphylococcus aureus, can be both a pathogen and a commensal depending on the circumstances. For example, it can cause infections in some individuals while living harmlessly on the skin of others. Option A is incorrect because a low infectious dose is not a defining characteristic of opportunistic pathogens. Option B is incorrect because not all infections lead to symptoms, as some individuals may be asymptomatic carriers. Option D is incorrect because endogenous infections are caused by microbes that are already present in the host's own microbiota, not necessarily the environment.

Which of the Following Statements About the Relationship Between Hosts