Disinfected mail
From Wikipedia, the free encyclopedia
Disinfected mail or fumigated mail is mail that has had some form of disinfection or fumigation applied to it by postal authorities, with the intention of preventing the spread of epidemics via letters sent from infected areas.
The usual practice was to puncture the envelope with small holes, often in a grid pattern, or to snip off one or more corners, in order to let the fumigation gases in. In addition, a special postal marking may note the disinfection process.
The process did not necessarily have a scientific basis; the practice dates from before an understanding of the cause of contagious diseases, and the fumigant was as likely to be based on folklore. For instance, in the Middle Ages Mediterranean ports such as Venice would smoke received covers or douse them with vinegar.
The cholera pandemics of the early 19th century led to widespread treatment of mail, although the concern had died down by the 1840s. Mail from the tropics, particularly Hawaii, was treated against yellow fever. In the 20th century some mail was heat-treated to prevent the spread of smallpox.
Most countries have instituted mail fumigation at one point or another, and investigation of the specific incidents is an active area for postal history; the Disinfected Mail Study Circle publishes about 300 pages of original research each year in its journal Pratique.
Irradiated mail is a form of disinfected mail adopted in the United States, in response to the 2001 anthrax attacks.
