Google has responded to calls from antivirus firms to stop the spread of an Internet worm that was using the search engine’s technology to spread among online bulletin boards.Antivirus firms say the Santy worm, which searches Google for sites using a vulnerable version of the phpBB bulletin board software, was spreading quickly and had already infected around 40,000 Web sites by Tuesday evening.On Wednesday, a Google spokesperson told ZDNet Australia that although Google users were not at risk from Santy, the search company had started blocking attempts by the worm to replicate.For more click here