title: East or west? The geographic origin of the Black Death.
mesh_terms: D002681:China; D004196:Disease Outbreaks / Q000453:epidemiology / Q000266:history*; D005060:Europe; D049691:History, Medieval; D006801:Humans; D007194:India; D010930:Plague / Q000453:epidemiology / Q000266:history* / Q000635:transmission; D012425:Russia (Pre-1917)