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Contagion (Mutation)

The infection is spreading, and you are not immune.

Infected attacks increase your Infection, which depletes over time. Reaching 100% Infection zombifies you (kills you and spawns a Special Infected). The Infected go down more easily, but you have less ammo.

NOTE: When you die by reaching 100% Infection, your corpse will be teleported outside the map. This is intentional, as it is neccessary in order to remove the player's corpse. Attempting to delete the dead player crashes the game, so moving it is the only option.

Recommended strategies:
Avoid damage as much as possible.
Use pistols or melee to conserve ammo.
Stick together so that you can free each other from Special Infected.
Revive downed teammates quickly.
Make use of grenades to manage hordes.

This mutation is intended to force players to play better, without needing to play on Advanced/Expert or Realism. It serves as a more effective learning environment to improve at the game, as it punishes poor performance in such a way that makes the player fail faster. Healing can undo damage, but time is the only remedy for Infection. Therefore, the player is punished for taking damage too often, raising their awareness as to how often they're taking damage. This makes the player more focused on avoiding damage, since they can no longer afford to take damage as often.
At the same time, killing zombies is easier, which makes it more approachable than increasing the difficulty setting. The limited ammo balances this out, as well as making the player spend their ammo more wisely.