- implementation: innate vs adaptive
a.) mediated (cell) vs non-mediated (humoral)
b.) cell mediated (eg phagocytosis, interferons) vs system mediated (fever, skin, hair, mucus, acid/base, complement); inflammation is kind of both - material: alive vs not alive
- location: surface vs internal
a.) internal: intra-cell vs inter-cell
b.) surface: skin vs everything else - type: direct (attack) vs indirect (interference)