1.   But pig tissue has its own drawbacks because some scientists worry that pig viruses can be transferred to people.

2.   It may be unlikely that a pig virus could wreak such havoc in humans, but the potential is still there.

3.   The agency had suspended such experiments because of new data on pig viruses.

4.   The company says no evidence of the pig virus has been found.

5.   This lowers the risk that any incipient pig virus would gain free rein, the researchers said.

6.   Another worry is whether the organs will carry pig viruses that could be harmful to people, especially if they spread from the organ recipient to others.

7.   However, Bach said he is concerned about possible pig viruses that have not been discovered yet.

8.   Scientists from around the world warn that the technique might allow a pig virus to cross species line and infect humans.

9.   The most rigorous international study ever on the safety of transplanting animal parts into humans found no evidence that people caught a worrisome pig virus.

10.   The pig industry in southern Thailand is planning a free pork feast to overcome a scare following the outbreak of a lethal pig virus in neighboring Malaysia.