Delay Disease

[JoCa]

The text of delay disease reads:
"The target becomes temporarily immune to disease. Any disease to which it is exposed during the spell's duration does not affect the target until the spell's duration has expired."

My question is: If a creature is exposed to a disease while under the spell, does it have to start making saving throws once the spell wears off? Or is it a temporary inoculation, and one only needs to make saves if it is exposed again after the spell's duration?

[MrCharisma]

The first option I think.
You still have to save, but not till later.

[thistledown]

Also, if this is for PFS remember you have to be a Ratfolk to take it.