Security experts eye worm attack

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Security experts are downplaying the potential impact of a virus which some believe is set to strike on 1 April.

Conficker has infected up to 15 million computers to date and is set to change the way it works on Wednesday.

There have been some reports the worm could trigger poisoned machines to access personal files, send spam, clog networks or crash sites.

"We don't know what will happen but don't expect anything dramatic," Symantec's Vincent Weafer told the BBC.

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