Is there any virus made for mac?

At any one time, the answer to this question could vary. In general, Macs are less prone to viruses than Windows-based computers. This is in part due to the smaller market share of Apple/Mac computers, and also due to the general design and architecture of the Apple computers.

In short, you shouldn't assume that because you have a Mac you are immune from attack, but your chances of being "infected" are much lower. You should still take appropriate measures to safeguard your computer per recommendations posted on the Apple website.