There are fears the disease could spread to Europe and America via plane travel as Ebola did in 2014, with ten African nations already put on alert for signs of infection.
The majority of those cases have been pneumonic plague, a more-deadly form of the bubonic plague which devastated Europe's population in the 1300s.
While the bubonic plague is spread through the bites of infected fleas, pneumonic plague is spread through the air, usually by coughing.
Symptoms include severe fever, headaches and coughing, with patients often coughing up blood.
It can be fatal within 72 hours of infection, though can also be cured with a course of antibiotics if administered quickly.
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