Question

what is the term for a person who shows no sign of illness but has pathogenic bacteria living on their skin, scalp, or inside their nose?
colonized
infected
carrier
none of the above

Explanation:

A carrier is an individual who harbors pathogenic bacteria (or other pathogens) but does not show symptoms of illness. Colonized refers to the presence of bacteria (or other microorganisms) on a body surface without necessarily causing disease, but it's not the specific term for a person with no illness signs. Infected implies there is an invasion of pathogens and usually some level of immune response or potential for symptoms. So the term that fits a person with no illness sign but having pathogenic bacteria is carrier.

Answer:

Carrier