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that you know of.
Besides, this article is probably discussing businesses. I know of no business who has been free of malware. Some have very low occurrences, and most of those are innocuous, while others have quite high rates of infection. Those w/ little problems in this regard have the same things in common: Discipline (as in don't surf porn, or download illegally), no admin rights locally, and web content/malware filters in use.