'Plague' in the Bible

But this will be the nature of the plague with which the Lord will strike all the nations that have fought against Jerusalem: Their flesh will decay while they stand on their feet, their eyes will rot away in their sockets, and their tongues will dissolve in their mouths.

This is the kind of plague that will devastate horses, mules, camels, donkeys, and all the other animals in those camps.

If the Egyptians will not do so, they will get no rain -- instead there will be the kind of plague which the Lord inflicts on any nations that do not go up to celebrate the Feast of Tabernacles.