The bacillus enters the blood stream going directly to the lymph nodes. Enlarging and inflaming of the glands causing buboes to appear in the groin, armpit, or neck. The flea gets the bacteria from a rat, and the flea then spreads the disease to humans. The bacteria completely fills the stomach of the flea making it so the flea can no longer digest any blood. The first symptoms of the Bubonic Plague are headache, nausea, vomitting, and aching joints.
Death comes in about four days after contracing the disease.
In the year 1347, in the southern Ukraine near the Black Sea, the native people began dying of a mysterious disease. They suffered from headaches, weakness, and staggering when they tried to walk. Lymph nodes in the groin and underarm areas begin to swell to the size of hen's eggs. These swellings were called buboes and led to the official name of their aillment, the Bubonic Plague. These natives called the plage the pestillance and were often dead by the fourth day of contraction.