septicemic plague
Noun
Meaning
an especially dangerous and generally fatal form of the plague in which infecting organisms invade the bloodstream; does not spread from person to person
Source: WordNetHypernyms
Examples
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.
Untreated, septicemic plague is usually fatal.