It's been 10 weeks now since Sven Jaschan, the alleged author of the Netsky and Sasser worm families was arrested. Even though he stopped writing and distributing his viruses two and half months ago, his viruses still top the charts.
For example. in our virus stats, 8 out of the top 10 viruses right now in the wild are Netsky variants.
Sasser is also still in found in the wild, although it's no longer nearly as common as Netsky. Sasser was a network worm, Netskies are email viruses. Network worms typically cause big peaks and then fade away...but won't die off totally for many years.