The dominant explanation for the Black Death is the plague theory, which attributes the outbreak to Yersinia pestis, also responsible for an epidemic that began in southern China in 1865, eventually spreading to India.
An estimate of the mortality rate for the modern bubonic plague, following the introduction of antibiotics, is 11% (by the US Centers for Disease Control (CDC)), although it may be much higher in economically or medically underdeveloped regions [REF].