During 14th century, a strange disease spread across Europe and killed 30-60% population that is approximately 25 million people. This event is also known as "The black death", the main cause of which is considered bubonic plague. This highly dangerous and contagious disease is caused by an infectious bacteria which causes inflammation of "Lymph nodes" mainly in armpit and groin. Main symptoms are high fever, chills, headache and swollen lymph nodes known as "Buboes". Also spots are formed on skin which are later turned black. The bacteria mainly affects rodents, then fleas transmit this disease to human.
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