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Overview[ | ]

Survivor's Immune System Strength, or "immunity" in short, is a Character Survival Stat in DayZ. When high enough, immunity will provide resistance against certain diseases and illnesses. Although the immunity level isn't directly shown to the player, like Stamina for example, it can be deduced from other visible stats. It can also be boosted temporarily to its maximum level by taking Multivitamin Pills.

Effect on diseases[ | ]

When the immunity is higher than the disease's potency value, it will start to kill off the harmful viruses, bacteria and chemicals present in the survivor's body, thus preventing or eventually curing the sickness. The affected diseases, their potencies and the maximum amount of time the immunity may take to cure the disease.

Disease Potency Time to cure
Cholera 95% 37 minutes
Salmonellosis 95% 5 minutes
Influenza 65% 25 minutes
Common Cold 65% 8 minutes
  • The time will be shorter if the disease
    hasn't progressed to its maximum severity.
  • Immunity has no impact on any other diseases.

Stat value[ | ]

Survivor's Immune System Strength is determined as the average value of their Energy, Water, Blood and Health stats.
So for example, if the energy is 70% of its maximum, water 30%, blood 100%, and health 60%, then the resulting stat is:

Immunity = (70% + 30% + 100% + 60%) / 4 = 65%

The immunity level can be roughly estimated by looking at the symbols of the aforementioned stats in the HUD, and calculating the lowest and highest possible averages of them:

Energy Water Blood Health
Symbol Range Symbol Range Symbol Range Symbol Range
IconHungry0
70 - 100%
WaterFull
70 - 100%
IconBlood0
90 - 100%
Custom Health 1
80 - 100%
IconHungry1
16 - 70%
WaterLess
16 - 70%
IconBlood1
80 - 90%
Custom Health 2
50 - 80%
IconHungry2 WARNING PLUS
6 - 16%
WaterYellow
6 - 16%
IconBlood2 WARNING PLUS
70 - 80%
Custom Health 3
30 - 50%
IconHungry3 CRITICAL PLUS
0 - 6%
WaterRed
0 - 6%
IconBlood3 CRITICAL PLUS
60 - 70%
Custom Health 4
15 - 30%
IconHungry4
0%
WaterEmpty
0%
IconBlood4 BLINKING PLUS
50 - 60%
Custom Health 5
0 - 15%

Note that the lowest value of Blood is 50%, and not zero as with others. This is because the character can only lose 50% of their blood without dying. In other words, the lowest possible immunity of a living survivor is 12.5%. ((0 + 0 + 50 + 0) / 4 = 12.5)

Multivitamin Pills will boost the survivor's immune system strength to 100% for their 5 minute duration. This can be used to cure the affected diseases, or even to allow safe consumption of dirty water or rotten/raw meat if you're in desperate need of energy or water.

Trivia[ | ]

  • Despite being shown next to the other four stats on the HUD, the Temperature stat is not related to Immune System.
  • Technically, Poisoning is also affected by Immune System. It's not mentioned above, because its Potency is 15%. For the immunity to get this low, it would mean the survivor would have to be seconds away from dying already, so getting incurably poisoned would be irrelevant at that point.
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