11 And the frogs shall depart from thee, and from thy houses, and from thy servants, and from thy people; they shall remain in the river only. 

12 And Moses and Aaron went out from Pharaoh: and Moses cried unto the Lord because of the frogs which he had brought against Pharaoh. 

13 And the Lord did according to the word of Moses; and the frogs died out of the houses, out of the villages, and out of the fields. 

14 And they gathered them together upon heaps: and the land stank.

As extensive as the curse had reached in Egypt, so too did the cure. From every place and from every people the frogs ceased to spread and multiply. But it does not seem that the frogs left those places, rather that they died within them. The people still had to do the work of gathering them from every nook and cranny. They placed them in large piles which spread the stench of dead amphibians across the land.

I mentioned earlier that the effects of the curse seem symbolic of how a people will adopt false and harmful philosophies. The lies and deceit spread into every place and affect every person, whether they personally believe the falsehoods or not. They corrupt every home and every public square. And so, too, even after the madness has been dispelled, when society returns back to basic truth and reason, there is still a period of labor where the vestige of the old lie must be eradicated wherever it is found. And, for a time, there is still the lingering stench of old prejudices and wrongs that hang in the air. The curse is gone, but not the memory of it.