The best replacement for immune system is lymphatic system.

The best alternatives to immune system are rated as following:
★★★★★  lymphatic system
★★★★★  hiv
★★★  adaptive
★★★  acquired immune system
★★  autoimmune system
★★  adaptive immune system
★  antibiotics
★  circulatory system
  immune system
  lymphatic

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Speaking about immune system, one probably shouldn't forget about immune system.

Other search terms related to immune system and their ratings are:
★★★★★ immune system
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immune system
lymphatic system
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