# Immunity to sickness
Immunity to sickness (also known as sickness resistance) is a property in NetHack.

Contents

1 Effects
2 Strategy
3 Variants
4 Messages

Effects
A monster with immunity to sickness is completely immune to both food poisoning and disease attacks from monsters like Juiblex.

Strategy
Acquiring the immunity allows you to safely eat old corpses (rotten or tainted), including corpses from mummies or zombies. However, in vanilla, only fungi and ghouls have immunity to sickness. 

Variants
The property is more common in SLASH'EM, where two roles, the Necromancer and the Undead Slayer, start the game with innate immunity to sickness. This does not imply that a Necromancer or Undead Slayer may safely eat anything; among other problems, corpses can be acidic or poisonous.
The Convict role in UnNetHack has intrinsic immunity to sickness.

Messages
You feel a slight illness.
A monster used its disease attack against you, but you have immunity to sickness.
It doesn't seem at all sickening though...
Appears immediately after the "Ulch! That 

<food> was tainted!" message. The corpse would give you food poisoning, but you have immunity to sickness.
You are immune to sickness.
Enlightenment message.

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It may contain text specific to NetHack 3.6.4. Information on this page may be out of date.
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