I don't know if anybody else has noticed, but for the time being, if you can, I suggest to increase the frequency that your AV updates.
At work I have to update it manyally (stupid Live update don't wanna work automatically) and I check the Symantec Resource Center everyday. Lately, in the past 2 months I had to increase to look every day. This last 2 weeks were even worse, there have been even 3 updates in a day. So now I am checking when I come to work, and after I leave
Just yesterday, we had a virus. The night before I updated the AV, it got in yesterday, and Symantec had an update just 20 minutes before we got the virus.
It has been some crazy weeks. I guess now would be a big time to check which AVs are actually good. Lots of MyDoom and Beagle versions around.
Cheers, and happy updating