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.
 * Multiple boogers can stick to one enemy to deal extra damage.
 * The booger tears deal their damage once per second.
 * Each tick of poison deals damage equal to Isaac's tear damage.
 * The booger lasts for 60 seconds or until the enemy dies.

Synergies

 * //: Each tear has a chance of being a booger tear. Increases chances of firing booger tears/
 * : 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.
 * : Booger damage is influenced by the damage of the individual tear, so fully-charged Chocolate Milk shots can result in very potent damage over time.
 * /: Tears and split tears have a chance of sticking to enemies. Booger tears will not split after killing enemies.
 * : Booger tears will split into split booger tears that can attach to enemies.
 * : Shots retain their aura while stuck to an enemy, but the aura can damage only enemies other than the booger victim. If the 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.
 * : Booger tears still look like normal haemolacria tears and will attach to enemies until enemies die or time runs out. After that, the tear bursts.
 * : Every damage instance that a booger shot does while attached to an enemy will trigger a chance for a coin to spawn.
 * : All tears have a chance to burst into boogers. Boogers will always burst into more boogers, though some of the boogers may incorrectly appear to be normal tears. When a booger sticks to a enemy, it will burst into 8 boogers which have a high chance of sticking again to the same enemy.
 * : 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.
 * : Booger tears will grow in size and damage as they travel. They are a blackish color.
 * : Boogers that fall off enemies will try to return to Isaac instead of falling straight down, making it easier for it to latch onto another enemy.
 * : Booger shots lose the Polyphemus pierce effect, but stick to enemies while dealing the full damage of the Polyphemus shot. Damage does not degrade.
 * : Shots that stick to enemies retain the damage they had at the moment of impact; no further decrease.
 * : Booger tears will be connected to other tears via electricity.

Interactions

 * : Overrides Sinus Infection.
 * Guppy (Transformation) : Boogers attached to enemies continually spawn blue flies as they deal damage.
 * : Holy light strikes do not activate on booger shots.
 * : Overrides Sinus Infection. Booger tears will still appear, but will act identically to other Ipecac shots.
 * : Lightning strikes do not activate on booger shots.
 * : 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.
 * : Shots that stick to enemies retain the damage they had at the moment of impact; no further increase.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.

In-game Footage
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