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Chemical Contagion 
Feat 16
Source Pathfinder Advanced Player's Guide
Trigger A creature within 30 feet critically fails its initial saving throw against a poison you created.
With carefully engineered enzymes, you coax some of your poison to infect another target, using the original victim as a carrier. A creature adjacent to the triggering creature is exposed to the triggering poison.
Traits
Common
Anything that doesn't list another rarity trait (uncommon, rare, or unique) automatically has the common trait. This rarity indicates that an ability, item, or spell is available to all players who meet the prerequisites for it. A creature of this rarity is generally known and can be summoned with the appropriate summon spell.
AlchemistThis indicates abilities from the alchemist class.