Following in the footsteps of McAfee and Open Door Networks, Kaspersky Lab has announced its first Mac security software.

With 85 percent of Mac users also owning a Windows PC, the company is pitching Kaspersky Anti-Virus for Mac primarily as a prophylactic to prevent Macs from spreading malware to Windows PCs via email, file-sharing, and other networked activities.

Kaspersky Lab argues that the Mac platform isn't inherently invulnerable and that, as Macs gain market share, malicious hackers could begin to see it a juicier target. So Kaspersky Anti-Virus for Mac will protect against Mac-specific malware, too, should such a thing ever exist in significant quantity.

Kaspersky Lab says the software scans and disinfects files - including email attachments and Web downloads - in real-time. It also claims that it'll take up just 1 percent of your CPU's resources when idle.

Kaspersky Anti-Virus for Mac requires Mac OS X 10.4.11 or higher and an Intel processor. A 1-year licence for a single Mac is £39. A 30-day free trial version (which can be upgraded to the licensed version) is available.