Infection is a 
Jakobs Pistol
Its special effect is Infection - Critical Hits have a 30% Change to change Element to Radiation with increased Radiation Status Effect Chance and increased Radiation Status Effect Damage for 6 seconds.
Use your favourite features in-game with our Desktop AppBorderlands 4 How to Unlock The Legendary Infection Jakobs Pistol
Weapons
Legendary Loot
Overview
How To Unlock
Unlock Location:
- Progress through the (FL4k And The Last Resort) DLC until reaching the Boss
Lieutenant Harmony
Farm Method:
- Defeat Lieutenant Harmony to get a chance at the Infection.
- After use the Encore Machine nearby to reset the fight.
- Repeatedly defeat Lieutenant Harmony until the Infection drops.