Pox Burster

Source Advanced Race Guide

A pox burster is an alchemically preserved animal bladder or gourd that has been filled with toxic, rotting materials. You can throw a pox burster as a splash weapon. Treat this attack as a ranged touch attack with a range increment of 10 feet. A direct hit forces a target to immediately make a DC 13 Fortitude save or contract Filth fever. Every space adjacent to the target square of the pox burster is covered in disease-causing filth. For the next minute, any creature that is injured while in one of these spaces must also make a DC 9 Fortitude save or contract Filth fever.