1.   But as viruses proliferate and spread over the Internet, virus hunters need new tools.

2.   For virus hunters, this year has been particularly troublesome.

3.   More than anything else, the Internet is changing the craft of the virus hunter.

4.   Virus hunters are engaged in the digital-age equivalent of medieval warfare, an escalating battle between arms and armor.

5.   Virus hunters have uncovered eight different versions, or variants, since October.

6.   What new threats are virus hunters looking for, just around the corner?

7.   White heads a team of virus hunters who take no chances.