November 11 (1938) is the anniversary of the death of "Typhoid Mary" Mallon.
n. one that is by force of circumstances a center from which something undesirable spreads
—Merriam-Webster’s Collegiate Dictionary, Eleventh Edition
When wheezing
and sneezing employees show up for work instead of taking an allotted sick day,
they are often called a Typhoid Mary—invoking the dead and virulent namesake of
hash- and fever-slinging Mary Mallon.

Mallon was born in 1869,
sought her fortune in the New World in 1884, and was well established as a cook
in New York City by the turn of the century. However, when members of one of
the families who hired her unexpectedly contracted typhoid, they hired civil
engineer and typhoid research George Soper to investigate. Soper soon
discovered that Mallon had sped through seven jobs between 1900 and 1907,
leaving a wake of twenty-two typhoid cases and at least one death. Though a
complete stranger to her, Soper approached Mallon, suggested she might have
typhoid, and requested stool, urine, and blood samples. The Irish cook refused,
and the rest is history.
Tensions escalated. Mallon
herself did not feel or appear sick and was convinced she was being unfairly
targeted as a working-class Irish woman. Soper, meanwhile, returned to question
Mallon again, this time with a doctor, followed eventually by a New York City
health inspector. Mallon refused them all. She was finally arrested, found to
be a carrier for typhoid, and placed in isolation for three years by the board
of health. Though Mallon was eventually released with the agreement that she
would no longer work as a cook, she soon discovered that work as a laundress or
other house servant paid comparatively little, so she assumed a fake name and
took a job cooking again in New York’s Sloane Hospital for Women. While there,
Mallon passed along her special sauce to twenty-five more unwitting victims,
one of whom died.
Mallon’s identity was
eventually discovered, and she was arrested and quarantined again on North
Brother Island. By this point, Mallon was known to have infected fifty-three
people total (three of whom died) and was referred to publicly as “Typhoid
Mary.” Sympathy for her cause had evaporated, and she would spend the rest of
her life under quarantine, suffer a paralyzing stroke, and ultimately die six
years later of pneumonia in 1938 at the age of sixty-nine.
It has since been theorized
that Mallon might have contracted typhoid from her mother before she was born
and simply never experienced any symptoms. Though she protested her innocence
to the end, an autopsy indicated that Typhoid Mary was still harboring live
bacteria in her gallbladder when she died.
Bon appétit.