But even software scans may not be enough to detect the Storm worm, according to Internet Security Systems' Corman.
But US officials said more time was needed to determine whether the internet had managed to escape the worm's wrath.
According to internet security specialist Sophos, the worm is a variant of the well-known "Dorkbot" worm which has been spread by social media platforms such as Facebook and Twitter.
Security experts say patterns of activity on the Internet could indicate that a new computer worm is about to attack.
Comparing Melissa to the Morris worm, Ira Winkler, president of Internet Security Advisers Group, a consultancy in Saverna Park, Md.
For nearly a year, cyber-security researchers have tracked the Storm worm as its malicious code spread across the Internet, drawing computers into a growing botnet of hijacked computers.
Subsequent investigation of the virus showed that it was written using a virus toolkit by the name of the Visual Basic Worm Generator that is widely available on the internet.
"If the proliferation of the worm and its resulting traffic was going to affect internet performance, it would surely be seen in these sites, " Keynote spokeswoman Mary Lindsay said.
Skype, the internet communications platform, is being used by hackers to distribute a "worm" that infects Windows PCs.
Even at Microsoft, not everyone applied the patch that would have fixed a known flaw exploited by the so-called SQL Slammer worm, which is estimated to have disrupted half of all internet traffic in January.
"Sasser is a successful and widely propagating worm with a somewhat benign impact to the end user, " said Chris Rouland of Internet Security Systems.
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