"They may have gone beyond that. There is evidence of carefully planned biological warfare against the army of Sennacherib when he tried to conquer Jerusalem. So the deuteronomists may have had an en of their very own. Or maybe they just understood viruses well enough that they knew how to take advantage of naturally occurring strains. The skills cultivated by these people were passed down in secret from one generation to the next and manifested themselves two thousand years later, in Europe, among the kabbalistic sorcerers, ba'al shems, masters of the divine name.