It all depends on how the chemical can be broken down and absorbed by a person. We don't know if the chemical can be absorbed by the skin or lungs, or ingested in the stomach. To many unknown factors.
But we now know what happens if you turn a person's immune system on full blast.
It's an antibody to CD28, Paul. We know how it can be absorbed - only IV, not oral or inhalation. Lousy BW.