The document discusses the Black Death plague that hit Europe in the mid-1300s. It was responsible for killing 30-60% of Europe's population and was a mixture of bubonic, septicaemic, and pneumonic plague. Pneumonic plague caused coughing up blood and spread easily between people, often causing death within three days. Septicaemic plague infected the bloodstream, turning the hands and feet black and hard. Both pneumonic and septicaemic plague had high mortality rates.