The 'Downadup' worm is spreading quickly and now infects more than 3.5 million PCs, according to the security company F-Secure. In a blog post, F-Secure put the total number of infected machines at an estimated 3,521,230 — a rise of more than a million machines over the previous day's tally. The security firm bases its estimates on information it has gleaned by tapping into infected machines.

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