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Medical mystery solved in slaughterhouse
AUSTIN, Minnesota (CNN) -- A mysterious nerve disorder that hit some slaughterhouse employees with debilitating symptoms apparently was caused by inhaling a fine mist of pig brain tissue.
Susan Kruse remains unable to work but has felt some relief with immunotherapy
treatments and medications.
While eating pig brains isn't dangerous, inhaling fumes from particles of pig
brain matter can be, scientists say.
A translator assisting Spanish-speaking patients helped to expose the hidden
risk, which prompted the Centers for Disease Control and Prevention to name a
new disease and led to changes in how pig brains are harvested.
Susan Kruse is one of the patients who suffered from the disease that's called
progressive inflammatory neuropathy, or PIN.
Her quest for health started with bizarre, unexplainable symptoms and took her
to nearly 20 doctors.
For more than 15 years, the 37-year-old mother worked a regular shift at Quality
Pork Processors in Austin, Minnesota. In her spare time, she renovated her home
with her boyfriend, son and stepdaughter.
In November 2006, the symptoms began. First, there were charley horse cramps in
her left calf that wouldn't go away. Within days, the debilitating aches moved
to her right leg. Within weeks, the tips of her fingers began to go numb.
Soon, the pins and needles spread to her feet.
She couldn't figure out what was happening to her body. She wasn't doing
anything differently. She hadn't had any major health problems in the past.
Kruse went to local doctors, but they had never seen anything quite like it.
"I was very scared," she said.
She underwent countless tests and saw almost 20 doctors, but all the diagnoses
were hazy -- everything from depression to gallstones.
By February 2007, Kruse could no longer stand for long periods. She had to give
up her job at a pork processing plant.
"The doctors couldn't believe how fast it came on. In a four-month period I went
from being able to walk to not being able to walk," Kruse said. "I'm only in my
middle 30s -- who needs to be in a wheelchair in the middle 30s?"
While Kruse continued to struggle with her illness, something strange was
unfolding a few blocks from her home.
At Austin Medical Center, a language interpreter began to notice a pattern.
Over the course of 2007, she found herself translating a similar list of
ailments from Spanish-speaking patients to doctors.
She heard the same complaints over and over: aching leg pain; an odd numbness
and tingling in the hands, legs and sometimes face; weakness; tiredness.
"There was a group of patients seeing different doctors that all seemed to have
a similar set of complaints," said Dr. Daniel Lachance, a neurologist.
At the time, Lachance worked at the Austin Medical Center and the Mayo Clinic in
Rochester. He asked Austin doctors to try to refer all the similar cases to him.
By late 2007, his team tracked down 12 people, including Kruse, with similar
stories.
"These individuals, one, had a common pattern of illness, but also they had
something else in common," Lachance said. "They all appeared to work in the same
place, which is Quality Pork Processors in Austin."
But the similarities didn't end there.
"When we looked a little further, it seemed that these workers were clustered in
a particular part of the plant," according to Dr. Ruth Lynfield, a leading
epidemiologist at the Minnesota Department of Health.
Lynfield surveyed the plant with QPP President Kelly Wadding. They focused on a
section of the plant called the "head table," the area where brain tissue was
harvested and packaged for export.
The market for pig brain tissue includes the American South, where it's used in
dishes such as brains and eggs. It's also sold in some Asian countries, such as
Cambodia and China, for various recipes, including stir-fries and stews. The
brain tissue processed at QPP was used mainly for export to Asia.
State and federal health authorities have said eating pork brains is safe. It's
the harvesting method, called "blowing brains," that posed the health risk.
In the procedure, high blasts of compressed air were shot into the head cavity
to remove the brains. Sometimes the liquid combined with brain tissue and turned
into a mist.
Health investigators said droplets of the mist could have entered a worker's
system through the mucous membranes in the nose or mouth. Once in the body, the
foreign pig brain matter prompted the immune system to produce antibodies to
attack it, in a process similar to an allergic reaction.
But the foreign matter seems to have also triggered an attack on the body's
nerve tissue, killing some of the nerves and causing the mysterious numbness.
On January 31, the CDC gave a new name to the unique constellation of ailments:
progressive inflammatory neuropathy, or PIN.
"The pattern of abnormalities falls into a combination that we really have not
seen with other illnesses," Lachance said.
He is helping to investigate whether PIN cases went unreported or undetected
before late 2006.
The CDC also is tracking two other plants that used the procedure. At one plant
in Indiana, there have been three confirmed cases. There have been no cases
confirmed at a Nebraska plant.
Pig brains are no longer harvested with compressed air. Health authorities have
said swift action by QPP management were key to containing the outbreak.
Wadding, who has been QPP president since 1997, said, "Since we put in some
precautionary measures and stopped harvesting brains, we have not had any new
cases."
To date, no one has died and most patients have recovered and returned to work.
Kruse remains unable to work, but she said she has felt some relief with
immunotherapy treatments and medications.
While health authorities are convinced the outbreak is contained, they said it
will take months, perhaps years, to understand fully what caused or triggered
the illness in workers.