The best replacement for immunity is cell mediated immunity.

The best alternatives to immunity are rated as following:
★★★★★  cell mediated immunity
★★★★  passive immunity
★★★★  adaptive immunity
★★  acquired immunity
★★  humoral immunity
★★  active immunity
★  vaccines
★  transactional immunity
★  resistance
★  cell mediated
★  tolerance
★  privilege
★  inflammation
★  innate immunity
★  specific immunity
★  impunity
★  thick fat
  thick fat snorlax
  ring vaccination
  acquired
  non specific immunity
  qualified immunity
  ollydbg
  passive
  vaccine
  antibody mediated immunity
  vaccination
  eat to live
  humoral
  nonspecific immunity

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Speaking about immunity, one probably shouldn't forget about specific immunity.

Other search terms related to immunity and their ratings are:
★★★★★ specific immunity
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immunity
cell mediated immunity
passive immunity