1.   Dioxin is suspected of having spread from tainted animal feed into all the animals that ate it, as well as all the products made with those animals.

2.   Ralston-Purina, which produced the tainted feed eaten by the Texas herd, agreed to buy the cattle and keep them out of the human feed chain.

3.   The Faillaces produced records that they said showed that neither flock had eaten tainted feed in Europe.

4.   Seven pig farms that received deliveries of tainted feed were quarantined last week, but officials said tests on the animals did not reveal traces of PCB.

5.   The government is having trouble pinpointing which farms used the tainted animal feed, forcing officials to keep the products off the shelves.

6.   The scandal was limited to poultry until Thursday, when it became evident pork and beef could also be contaminated by the tainted feed.

7.   The resignation came after revelations that animals fed on tainted feed had reached the market because the agency overlooked test samples.

8.   The scandal was limited to poultry until Thursday, but then it became evident pork and beef could also be contaminated by the tainted feed.