Do I need an antivirus scanner for Linux?

I’m about to switch from Windows over to Linux (my favorite distro of choice being OpenSUSE). The question that keeps burning in my mind is this: do I need an anti virus installed on my Linux machine like I do in Windows?
How about a mac (I’m going to buy my mother a mac book within the next two days.)?
Thank you
If I do need an antivirus, what would you recommend?