The mass-mailing MyDoom virus has become the fastest spreading program to date and the damage could continue for months or years.

The virulent program has flooded the Internet with e-mail messages bearing the program, doubling the time it takes most major Web sites to deliver a page. About one in every 12 messages being sent through the Internet contains the virus, said e-mail service provider MessageLabs. The previously most prevalent mass-mailing virus, called Sobig.F, only accounted for one out of every 17 e-mail messages.

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