The Plague : Dangerous to Human Species

Plague is a deadly infectious disease that is caused by the enterobacteria Yersinia pestis, named after the French-Swiss bacteriologist Alexandre Yersin. Until June 2007, plague was one of the three epidemic diseases specifically reportable to the World Health Organization.
Depending on lung infection, or sanitary conditions, plague can be spread in the air, by direct contact, or by contaminated undercooked food or materials. The symptoms of plague depend on the concentrated areas of infection in each person: bubonic plague in lymph nodes, septicemic plague in blood vessels, pneumonic plague in lungs, and so on. It is treatable if detected early. Plague is still endemic in some parts of the world.
In a recent case:

 China has sealed off parts of its northwestern city of Yumen after a resident died of bubonic plague last week, state media reported on Tuesday.

A 38-year-old victim was infected by a marmot, a wild rodent, and died on July 16. Several districts of the city of about 100,000 people in Gansu province were subsequently turned into special quarantine zones, Xinhua said.

On 18-7-2014 : The Colorado Department of Public Health and Environment said Friday that three additional cases of plague have been diagnosed in Colorado.

Officials said the newest cases are related to an incident about eight days ago, in which the owner of a dog who had died had also contracted the illness