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Anyone in constant contact with plague victims, such as doctors, nurses, inspectors, were compelled to carry coloured staffs outdoors so that they could be easily seen and avoided. When one person in a house caught the plague the house was sealed until 40 days after the victim either recovered or died (usually the latter). Guards were posted at the door to see that no one got out. The guard had to be bribed to allow any food to passed to the inmates. It was not unknown for families to break through the walls of the house to escape, and in several cases they carefully lowered a noose over the guard’s head from an attic window and hung him so they could get away.
http://www.britainexpress.com/History/plague.htm
courtesy of Bianca Pasternack