Deadly U.S. pig virus can be carried in
animal feed: study
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[August 15, 2014] By
CHICAGO (Reuters) - A research study has
shown for the first time that livestock feed can carry a virus that has
killed about 13 percent of the U.S. hog herd, the study's lead author
said, confirming suspicions among farmers and veterinarians battling
The findings, published this month in the peer-reviewed BMC
Veterinary Research journal, bring increased scrutiny on the feed
industry in the fight against Porcine Epidemic Diarrhea virus, or
The fast-moving virus has killed an estimated 8 million piglets
since it was first identified in the United States last year,
pushing U.S. pork prices to record highs.
In the study, researchers collected feed residue from three farms in
Iowa and Minnesota that had outbreaks of PEDv and had received feed
from the same source. They fed it to five piglets in an experiment
at South Dakota State University, and all became infected with the
virus. Piglets that were not fed the infected feed did not get sick.
"This study helped validate that the virus was alive in the feed,"
said Scott Dee, director of research for Pipestone Veterinary Clinic
in Minnesota and lead author of the study, in an interview. "That
had never been done before."
The study did not determine how the feed became infected with PEDv.
It is possible that ingredients in the feed, such as corn or
soybeans, were contaminated with the virus. The feed also could have
been contaminated in other ways, such as during transportation, Dee
said. It did not contain pig blood products used in feed that are
suspected by some of transmitting the disease.
Researchers have been trying to identify the ways in which PEDv is
spreading to help control outbreaks. The results of Dee's study are
"one more piece of the puzzle that we've been looking for," said Tom
Burkgren, executive director of the American Association of Swine
The American Feed Industry Association declined to comment.
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The study shows it is critical for farmers to press feed suppliers
about the practices used to prevent PEDv contamination, said Paul
Sundberg, vice president of science and technology for the National
"Quiz them and challenge them to ensure that the biosecurity in that
feed handling system is sufficient in preventing PEDv in getting
through to that feed," he said.
Researchers had previously established that PEDv was transmitted
from pig to pig by contact with manure, which contains the virus. It
can also be spread from farm to farm on trucks. The virus causes
diarrhea and vomiting and is nearly always lethal to baby piglets.
(Reporting by Tom Polansek; Editing by Chris Reese)
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