It's not at all clear. It's deliberately ambiguous. If they wanted it to be clea...

		mindrag on April 5, 2012 \| parent \| context \| favorite \| on: Flashback trojan reportedly controls half a millio... It's not at all clear. It's deliberately ambiguous. If they wanted it to be clear they would have said "Macs are only susceptible to a fraction of the number of viruses plaguing Windows-based computers."