The bacterial species Staphylococus aureus is found on the skin and in the nasal passages of about 20% of the human population. In healthy individuals, S. aureus is benign (does not cause harm) in these locations. However, if it is introduced into the bloodstream through, for example, a wound, it can make a person gravely ill. Thus, the ecological relationship of S. aureus with a human:
A)can be mutualistic or antagonistic.
B)is always antagonistic.
C)is always mutualistic.
D)is fixed or unchanging.
E)is benign.

Question

Quizplus · Accepted Answer

The ecological relationship between S. aureus and a human can be either mutualistic (the bacteria are harmless and may even provide some benefits to the host) or antagonistic (the bacteria can cause harmful infections in the host). It depends on the context and location of the bacteria within the host's body. Therefore, choice A is the best answer.

The Bacterial Species Staphylococus Aureus Is Found on the Skin