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“The patient had septicemic plague, which is in the blood and cannot be spread to other people. The resident recovered, and no other cases were identified,” officials said.

But the disease can lead to quick death if the bacteria infect the respiratory system or bloodstream in rarer conditions known as pneumonic and septicemic plague.

There are three main types of plague in humans, according to the Centers for Disease Control and Prevention: bubonic plague, pneumonic plague and septicemic plague.

The bacterium that cause plague, Yersinia pestis, can cause several types of potentially fatal illnesses: bubonic plague, pneumonic plague and septicemic plague.

But what made the germ -- which can trigger bubonic, pneumonic or septicemic plague -- so lethal?