I like the Game very and buyed a while ago and watched his progress, but i was always interested on the zombie virus, he is transmited (normaly) With body liquids (blood..) so are bloodsplatter a danger like bittes. So a splatter flys in to your Eye or Mouth (some kind of Chance) And if your unlucky the infected blood goes in the body and your infected! If your remove the splatter nothing happens. The same for clothing Form Zeds Maybe they habe bitten and some blood is in the clothing and wear it and your have a wound witch is not bandaged it will be infected. Or a Zed fell in your collector and the collector is full with water, the water is wasted. Sorry for bad English, im from german