A computer virus that was dormant for nearly two weeks has awakened, hitting several corporate networks and sparking security experts this morning to upgrade warnings for the infection from "low" to "medium."

The so-called stages.worm virus has been found in email attachments in messages with the subject lines "Funny" and "Jokes." Like the "I Love You" and Melissa viruses, stages.worm replicates itself through IRC (Internet Relay Chat) channels and Microsoft´s Outlook Express email program.

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