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FDA Proposes New Rules to Avoid 'Mad Cow'

Rules Would Cover All Animal Food, Including Pet Food

Blood Issue

The proposed new rules don't cover cattle blood and several other body parts.

"We've spent a lot of time researching infectivity of all tissues, and cattle blood does not appear to be a tissue which is capable of transmitting the disease from one cow to another cow, which is the most susceptible species," Sundlof said.

"I think even though there are some researchers who are concerned about blood, experimentally it has not been shown to be able to transmit the disease, and world standards are now going in the direction that blood and blood products from cattle, even in BSE-positive countries, can be traded internationally without health concerns," he said.

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