Federal officials say there may be a second case of mad cow disease in the United States.
The Agriculture Department says it will be four to seven days before the possible case can be verified.
Mad cow disease (bovine spongiform encephalopathy) attacks an animal's nervous system. People who eat contaminated food can contract a rare disease that's nearly always fatal.
A USDA official says an "inconclusive result" to tests doesn't yet prove there's a second case. She says inconclusive results "are a normal component of screening tests."
She says the animal "did not enter the food or feed chain." The possible case comes eleven months after the U.S. had its first confirmed case of mad cow. Japan and other countries still have bans on U.S. beef due to the first case.
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What Is Mad Cow Disease?
What is Mad cow (BSE)?
Transmission to Humans
Symptoms of VCJD
Sources: http://www.cdc.gov/od/oc/media/fact/cjd.htm (The Center for Disease Control Web site) and http://cjdfoundation.org/CJDInfo.html (The Creutxfeldt-Jakob Disease Foundation Web site)