Plague

The plague is an infectious disease caused by the bacteria Yersinia pestis. Bubonic plague is the most common type in humans. It is transmitted to humans by fleas, by direct exposure to infected tissues or aerosol droplets.

The disease is characterized by fever, chills, headache, and tender lymph glands.

If diagnosed early, bubonic plague can be successfully treated with antibiotics.

Source: GreenFacts, Based on the Centers for Diesease Control and Prevention Plague (Yersinia pestis) 

Concern exists about the use of plague as a biological weapon. Plague bacteria could be put into a form that might be sprayed through the air, infecting anyone inhaling it and causing pneumonic plague, which affects the lungs and spreads easily from person to person. This form of the plague is one of the most deadly infectious diseases.

Source: MayoClinic Plague 

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