ah, must have missed that one. Thanks, Sindatur
But that leads us to another gap I'd like to be filled:
how did Section 31 discover/develop the desease in the first place? It would require at least one changeling for researching their physiology and they could easily have used that "guinea-pig" to infect the Great Link instead of infecting Odo at the off-chance that he might one day go back to his people and infect them.
And when Odo was cured, why didn't he cure the orther Founders immediately? They'd have owed him then and the whole Dominion War could have been ended then and there.