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Sophos says Switch
They go on to claim that the top 10 forms of malware for the PC are not capable of infecting the Mac OS. I don't think these forms of malware will never surface in a form that's capable to infect Macs, but it's certainly less likely there will be malware for the Mac OS than for Windows.
Sophos' claim has certainly run into a lot of criticism from users that refuse to believe Macs are any more immune to viruses than Windows, but when windows sets the security bar as low as it does, it's hard for other OSes to not exceed it.