The bacterial species Staphylococcus 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:

The ecological relationship of Staphylococcus aureus with a human can be  mutualistic or antagonistic.

Explanation:

Mutualism is a type of ecological interaction. It occurs between 2 individuals in which each individual has a net benefit.

Antagonism is the opposite of Mutualism. It also occurs between two individuals but in this case one specie is getting the advantage at the  expense of the other specie.

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explanation: