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This ability was changed from complete immunity on all levels to resistance based on Skill Proficiency.
Immunity is a versatile skill that grants the target 100% resistance against any attacks that the user has been buffed against. For instance, if you have Immunity Virulent active, any virulent attack you are hit with will display the words "immune" above your avatar's head, just like when you try to shoot a Kael with a physical weapon.
Another useful feature is that immunities can be stacked on any given target. So it is completely possible to buff your groups main tank against all 5 immunity varients provided that you have the correct skills allocated to it. Be forewarned, since the duration is only 30 seconds, it will require careful timing to keep your tank buffed and still provide the group support expected of you as a medic.