The Internet Storm Center shares that February 2005 was a very active month for new variants and worm developments.  Almost 100 new viruses were categorized as “2“ or higher by Symantec

http://isc.sans.org//diary.php?date=2005-02-26

http://securityresponse.symantec.com/avcenter/vinfodb.html

Quote: This has been a record week for new virus discovery - at least for me. We yet again saw an infiltration of new activity at one location here in our local area. In looking at todays list on Symantec's web site, in the last week there have been 24 new entries that are rated as a Level 2. In the last month there have been close to 100 new entries with the majority being Level 2 and one of them being Level 3.