Sinus Infection

Sinus Infection is a passive item added in The Binding of Isaac: Afterbirth †.

Effects

 * Grants a chance to fire a booger that sticks to an enemy and deals damage over time.
 * Multiple boogers can stick to one enemy to deal extra damage.
 * Each booger deals damage equal to Isaac's tear damage every second.
 * The booger lasts for 60 seconds or until the enemy dies.
 * The booger lasts 10 seconds.
 * Boogers cannot pierce and stick to the first enemy that they come in contact with, but will pass through fireplaces even without piercing shots.

Synergies

 * : 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.
 * : 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 an enemy, it will burst into 8 boogers which have a high chance of sticking again to the same enemy.
 * : Boogers that stick to enemies will block shots, and will not be destroyed in the process.
 * : Booger shots lose the Polyphemus pierce effect, but stick to enemies while dealing the full damage of the Polyphemus shot. Damage does not degrade.
 * : Swing has chance to apply booger on enemy.
 * : Attraction effect will remain on the booger shot stuck to an enemy. This can drag the enemy across the whole room until they reach one wall and get stuck on it, effectively disabling their normal movement.
 * : Hit enemies have a chance for a booger to be applied to them.
 * : Hit enemies have a chance for a booger to be applied to them.

Interactions

 * Any status effect: A booger tear cannot inflict status effects, even if the booger's appearance changes.
 * : Overrides Sinus Infection.
 * /: Booger tears will not split after killing enemies.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.
 * : 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.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.
 * : Overrides Sinus Infection.
 * : Hit enemies have a chance for a booger to be applied to them.
 * : Overrides Sinus Infection.
 * : Each tick of damage has a chance to attach a booger tear to the affected enemy.