Commensals do not need virulence factors to survive on their host because:
A) they are well adapted for their specific niche
B) they do not breach the host barriers and immune system
C) they are recognized as self by the host
D) A and B only
E) all of the above

Question

Quizplus · Accepted Answer

Commensals have evolved to live in harmony with their host, and as such, they do not need virulence factors to survive. They are adapted to their specific niche, and they do not breach the host barriers or immune system. However, they are not necessarily recognized as self by the host, which is why they sometimes trigger an immune response. Therefore, options A and B are correct, but option C is not entirely accurate.

Commensals Do Not Need Virulence Factors to Survive on Their