Plaguebearer

Starting at 13th level, any creature that strikes a blight druid with a touch attack, unarmed strike, or natural weapon must succeed at a Fortitude save with a DC of 10 + 1/2 the druid's level + the druid's Wisdom modifier or become nauseated for 1 round and contract bubonic plague, as the contagion spell. If the creature makes its save, it is immune to this effect for 24 hours.