One of the places the assassins went to spread the virus was the Gilroy Garlic Festival.
Evidently, one of the assassins had a turn of heart, did he take a gun to the others?
The virus was relased last year, late May, early June, and it was the primary reason the trade deal fell over. Both CCP and the Demon-crats KNEW it was coming. The Demon-crats delayed the impeachment to obscure the disease development.
The reason the the folks in Chicargo have antibodies, is because the germ had time to move through the community, and the community developed resistance.