There are currently no viruses in the wild for OS X or OS X Mobile, the operating system iPhone uses. Currently, iPhone is closed to the kind of third party development that could allow viruses to become an issue. Also, Apple has been swift to respond to any vulnerabilities found in desktop OS X and has released patches before such issues have affected consumers. It is very rare that such vulnerabilities are found. On the few occasions I’ve known it to happen, it has become headline news.