Viruses? The "very few" instances of malware is shown below.This is absolutely not true, and somewhat dangerous. There are plenty of Mac viruses.
Flashback malware Mac Flashback malware: What it is and how to get rid of it (FAQ) - April 2012
OSX/KitM.A 'Lame' Mac malware finds success in spearphishing - May 2013
OSX/Proton Malware is Back! Here’s What Mac Users Need to Know - Oct 2017
¡Ay, MaMi! New DNS-hijacking Mac malware discovered - January 2018