Finnish security software and services company F-Secure said late Wednesday that the “MyDoom” virus is the fastest-spreading worm ever and the “worst e-mail worm incident in virus history.” CNET reports: “MyDoom crawled onto the Internet on Monday, quickly clogging e-mail servers, as it propagated itself with millions of messages laden withmalicious software code. An offshoot of the pest surfaced Wednesday but did not appear to be spreading nearly as quickly as the original. F-Secure estimated that the worm was accounting for 20 percent to 30 percent of worldwide e-mail traffic Wednesday, putting it well ahead of previous nasties, such as the SoBig.F worm.”