SURVIVOR HEALTH · DAYZ
Gas poisoning
Chemical contamination is driven by CHEMICAL_POISON and progresses through three contamination modifiers.
Effects in DayZ
Early contamination causes coughing. Later stages can cause vomiting; the final stage also causes severe shock and health loss.
What helps
The AntiChemInjector clears chemical poison outside stage three. At stage three it reduces the count to the stage-two activation threshold instead.
A transfusion from a bag without chemical poison can also reduce that agent in the recipient in proportion to the blood transferred.
Important distinctions
At stage three the injection is a reduction, not a full agent clear. Charcoal does not implement this chemical-agent treatment.
Related medical items
Open an item for its uses, effects and limitations.
Game-script references
Reviewed from the local DayZ scripts on 26 October 2026. These references describe the game mechanics, not a measured infection probability.
ContaminationStage1Mdfr— scripts/4_world/classes/playermodifiers/modifiers/diseases/contamination.cContaminationStage2Mdfr— scripts/4_world/classes/playermodifiers/modifiers/diseases/contamination2.cContaminationStage3Mdfr— scripts/4_world/classes/playermodifiers/modifiers/diseases/contamination3.canticheminjector— scripts/4_world/entities/itembase/gear/medical/anticheminjector.cactiongivebloodself— scripts/4_world/classes/useractionscomponent/actions/continuous/medical/actiongivebloodself.c