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Dangerous Mydoom Variant Appears: Page 3 of 3

Moscow-based Kaspersky Labs agreed. "Our analysts believe that Mydoom.b is probably using machines infected by the original Mydoom," said Kaspersky spokesman Denis Zenkin in an e-mailed statement. "The computer community may be facing a much more serious outbreak than the one caused by Mydoom.a yesterday."

Anti-virus firms are racing to combat Mydoom.b with updated virus definition files, but not all companies have yet posted alerts for the variant, nor updates that can defend and disinfect.