The bubonic plague is the most common form of plague, an infectious disease caused by the Yersinia pesits, a micro-organism that usually attacks rodents. Fleas that infest infected rats can transmit the disease to humans. The main symptoms are an extremely high fever, sometimes accompanied by delirium where the affected individual speaks incoherently; in some cases the patient is in a state of shock, no longer able to communicate or move; and one or more buboes are observed, extremely swollen lymph nodes. With early administration of antibiotics, the bubonic plague can be cured. Any manifestation of plague must be alerted to your local regional health authorities.