An eMail worm that looks like a normal error message but actually contains a malicious program continued to snarl computers around the world Jan. 27. Security experts described it as the largest virus-like outbreak in months, one made even more troublesome by its timing.

MessageLabs Inc., which scans eMail messages for viruses, said one in every 12 messages sent on Tuesday contained the worm, called "Mydoom" or "Novarg."

The worm began spreading rapidly Jan. 26 during business hours in the United States, where the world's computers are concentrated. Many

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