Sinus Infection

Sinus Infection is a passive item added in Afterbirth †.

Effects

 * Grants a chance to fire a booger which sticks to an enemy and poisons it.
 * Each tick of poison deals damage equal to Isaac's tear damage.
 * The booger lasts for 60 seconds or until the enemy dies.

Synergies

 * Apple!: Tears can gain the effects of razors, boogers, or both, though the chance for both to occur on the same tear is low. Razor blades visually override boogers in these cases.
 * Godhead: Shots retain their damaging aura while stuck to enemies, and if an enemy dies while duration remains, it will resume homing and will often stick to a second enemy.
 * Guppy: Every damage instance that a booger shot does while attached to an enemy will trigger a fly to spawn.
 * Head Of The Keeper: Every damage instance that a booger shot does while attached to an enemy will trigger a chance for a coin to spawn.
 * Lost Contact: Tears that stick to enemies will block shots and will not be destroyed upon blocking a shot, preventing an enemy from firing in a given direction until death or expiration of the effect.
 * Polyphemus: Booger shots lose the Polyphemus pierce effect, but stick to enemies while dealing the full damage of the Polyphemus shot. Damage does not degrade.
 * Proptosis: Shots that stick to enemies retain the damage they had at the moment of impact; no further decrease.

Interactions

 * Brimstone: Overrides Sinus Infection.
 * Holy Light: Holy light strikes do not activate on booger shots.
 * Jacob's Ladder: Lightning strikes do not activate on booger shots.
 * The Ludovico Technique: The large tear has a chance to stick to enemies. The tear cannot be controlled while it is stuck to an enemy, and cannot be removed until the enemy has died. Additionally, the tear does not inflict poison damage.
 * A Lump of Coal: Shots that stick to enemies retain the damage they had at the moment of impact; no further increase.
 * Mom's Knife: Overrides Sinus Infection.
 * Technology: Overrides Sinus Infection.
 * Tech X: Overrides Sinus Infection.
 * Fire mind: Overrides the view od Sinus Infection´s tears. Tears will still get stuck

In-game Footage
Sinus Infection