have invaded host tissues. The medical term for one of these encapsulated areas is a(n) .

The medical term for an encapsulated area where an infection or pathogens have invaded host tissues is an "abscess." An abscess is a localized collection of pus that can occur in any part of the body due to the body's immune response to infection. The pus inside an abscess consists of dead tissue, bacteria, and immune cells. The body attempts to isolate the infection by forming a fibrous wall around the area, which leads to the encapsulation. Symptoms may include pain, swelling, redness, and warmth in the affected area. Treatment often involves draining the abscess and administering antibiotics to control the infection.