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I don’t see any way for WebRep to report a site as infected. Red just means a lot of users didn’t like it, hopefully with the content icons indicating why. Any infection reports I have seen were from Network Shield, since you are blocked from going to the infected site to see what WebRep might think of it anyway. See http://forum.avast.com/index.php?topic=75453.msg624461#msg624461 for example.