Which term describes the infestation by head lice?

• A. Pediculosis
• B. Contagions
• C. Immunity
• D. External parasites

Answer: (A)

Infestation by head lice is described by the term pediculosis. This word precisely denotes the condition of being infested with lice, and for the head specifically you might hear pediculosis capitis. The other options don’t describe the infestation itself: contagions refers to diseases that spread, immunity is the body's resistance to disease, and external parasites is a broad label for organisms living on the outside of a host rather than the state of infestation. Pediculosis clearly identifies the situation of having head lice.