Do Macs get viruses?

I think no..and possibly no...

every os get virus once there are not protected

NO.

Macs have special security integration unlike other OS. A Mac could receive virus but won't let it execute and dominate its system - in other words, it cannot multiply and nest or damage/corrupt the system. 

 

There are NO viruses in the wild that affect Mac OS X at this time.

Sure.
It would be naive to imagine that any operating system would be completely safe from viruses, but Macs are probably as close as you can get.
Between OS built-in security, Apple’s aggressiveness in constantly improving the security of their products, and the relatively small market footprint that Macs have