1.   The myxomatosis virus has killed far more rabbits than have foxes.

2.   But instead of merely making the mice sterile, the genetically engineered virus killed the mice by destroying their immune systems.

3.   But the rabies virus does not kill the infected T cells.

4.   But the virus can kill poultry, and the customary way to eliminate the threat is to kill those birds exposed to it.

5.   But this rabies virus does not kill the infected cells.

6.   Doctors agreed that it was a minor miracle the brain virus had not killed Carter.

7.   From that emerged what came to be seen as the central mystery of AIDS -- how can so few viruses be killing all those white blood cells?

8.   Given such bleak news, some fans thought the virus had killed their idol.

9.   Researchers suggested elaborate explanations as to how the virus might kill T cells indirectly.

10.   Researchers are just starting to learn how the virus kills, reports Josie Glausiusz.