Date of the septicemic plague?
Septicemic plague is one of the forms of Bubonic plague. Instead of pustules, the disease is carried through the bloodstream and can be fatal within a matter of hours. The Black Death in Europe between 1347-1352 (with many later recurrences, although on a less dramatic scale) would likely be the date you are looking for. History does not have evidence of a strictly septicemic plague. Historians are also not certain if the Bubonic, Pneumonic, and Septicemic forms of Plague were the cause of the Black Death, but it is the most commonly accepted answer for the disease that killed about half of the population of Europe.