Final answer:
The type of cell from the adaptive immune response that is used for intracellular bacteria and protozoa is TH1 cells. These cells aid in the activation of macrophages and other T cells to eliminate pathogens inside of cells.
Step-by-step explanation:
For a pathogen that includes intracellular bacteria and protozoa, the type of cell used in the adaptive immune response would be TH1 cells. These cells are part of the helper T lymphocytes (TH) and are essential for dealing with intracellular pathogens such as Mycobacterium tuberculosis. TH1 cells secrete cytokines that enhance the activities of macrophages and other T cells, which helps in eliminating the bacteria residing within the immune cells themselves.
Contrary to TH1 cells, TH2 cells are responsible for stimulating naive B cells to secrete antibodies, which are most effective against extracellular pathogens, so they would not be the primary cells involved in an immune response against intracellular bacteria and protozoa.
While TH17 cells and B cells have their respective roles in the immune system, TH17 cells are typically associated with chronic mucocutaneous infections, and B cells are involved in the humoral immune response. Therefore, the most suitable option for an adaptive immune response to intracellular bacteria and protozoa is TH1 cells.