The National Zoo's chief veterinarian Suzan Murray has been watching the newborn and listening in on a video monitor.

NPR: National Zoo Welcomes Baby Panda

"Evidence shows that our systems and safeguards to prevent BSE are working, as are similar actions taken by countries around the world, " said John Clifford, the Agriculture Department's chief veterinarian.

CNN: USDA quarantines 2 farms in mad cow investigation

After the mother panda's distress call Sunday, a veterinarian examined the cub and observed that it was not breathing and had no heartbeat, said Suzan Murray, the zoo's chief veterinarian.

CNN: Panda cub dies at Smithsonian's National Zoo

Celeste Kunz, chief examining veterinarian at the New York Racing Association and a 19-year veterinarian, said Monday that she suspected a tainted substance was injected into the horses.

CNN: Officials suspect drug reaction or toxins in Florida horse deaths