<Tr> <Th> Specialty </Th> <Td> Infectious disease </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Plague is an infectious disease that is caused by the bacterium Yersinia pestis . Depending on lung infection, or sanitary conditions, plague can be spread in the air, by direct contact, or very rarely by contaminated undercooked food . 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 . It is treatable if detected early . Plague is still relatively common in some remote parts of the world . </P> <P> Historically, what are thought to have been massive pandemics of plague swept through Eurasia with very high death rates and causing major cultural changes . The largest of these were the Plague of Justinian of 541--542, the Black Death of the 1340s, continuing in the Second plague pandemic to break out at intervals, and the Third plague pandemic beginning in 1855 and considered inactive from 1959 . </P>

What type of disease is the black death
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