The staff development nurse at the hospital is teaching other nurses about the infectious process. Which statement by a nurse in the class indicates that this class participant needs further teaching about the concept of commensal microorganisms?
A) "A commensal microorganism is normal flora."
B) "These microorganisms can cause disease if they enter sterile tissues of the body."
C) "A commensal microorganism is always damaging to the host."
D) "A commensal microorganism derives benefits from the host."
C) "A commensal microorganism is always damaging to the host."
Explanation: A) Commensal microorganisms make up the commensal flora or normal flora or, as they have more recently been termed, the normal microbiota of the host.
B) Many of these microorganisms can cause disease if they enter the sterile organs or tissues of the body.
C) Commensal microorganisms not only derive benefit from the host but also confer benefit to the host.
D) Commensal microorganisms not only derive benefit from the host but also confer benefit to the host.
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