Talk:Combot/@comment-1763304-20150109174415/@comment-76.184.229.201-20150328001119

It's just a game. Just ignore logic and enjoy killing the zombies. But, if you really want to know, the pods level description mentions cyborgs and machine interfaces being infected. The machine interfaces created the strain of the virus. Most likely, the interfaces are within the cyborgs, where biological and technological communication is essential. After that, the digital virus started spreading to machines without biological components.