As if she had suddenly realized something, Kathryn screamed, "Are you saying that this isn't a natural disaster, but a man-made one? The virus in Niu Erwa's body was man-made?"

Qin Haodong said, "You're only half right. Niu Erwa was indeed bitten by a bat and got infected with this virus. However, it's very likely that this virus was man-made and used on a bat, so it could be more secretive."

Su Hui said, "That is to say, there is someone behind the zombie ...