Staphylococcus aureus is a bacterium that causes a variety of human ailments including boils, sties, and infections. While this bacterium is commonly found on the skin, mouth and nose, it does not usually cause harm unless it enters the body through an open wound.

True.

Explanation:

Staphylococcus aureus is a bacteria that can be in the skin, nose, mouth, under the armpits, or on skin folds, but that is harmless unless that it enters the body through a cut or open wound. Once inside the body, the bacteria can cause different types of infections. These infections can be small ones or big ones such as pneumonia, meningitis, or endocarditis. The bacteria spread from one person to another by skin to skin contact or by being in touch with contaminated surfaces. That is why we should avoid touching dirty places, and we should wash our hands periodically.