...the fury of the contagion was such at some particular times, and people sickened so fast and died so soon, that it was impossible, and indeed to no purpose, to go about to inquire who was sick and who was well, or to shut them up with such exactness as the thing required, almost every house in a whole street being infected, and in many places everyperson in some of the houses; and that which was still worse, by the time that the houses were known to be infected, most of the persons infected would be stone dead, and the rest run away for fear of being shut up; so that it was to very small purpose to call them infected houses and shut them up, the infection having ravaged and taken its leave of the house before it was really known that the family was any way touched.
from A Journal of the Plague Year, from the works of Daniel Defoe at Project Gutenberg.