Did it say which URL it considered a threat, or was it the root domain?
ZD constantly gets harassed by virus scanning tools. There are 20,600 files on ZD so that leaves plenty of options for false positives. There are also tools which automatically scan websites, decide that a website has a virus, and then emails the hosting company and puts the IP on a blacklist. The last such incident ended with me having to move to a different server altogether, and the virus in question - it was a 10 year old text file, only 860 bytes long. Not even close to an actual virus.
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