While surfing I found a noticeable change into Apple website, the Apple silently removed a statement saying It doesn't get PC viruses. Now it has been changed to It's built to be safe.
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What Apple is doing for security threats?
Apple is the only company that was not having problems of viruses, but in the world of technology no one is perfect. Now, Apple is taking security threats more seriously. In keeping mind the security threats Apple is going to introduce a new app called Gatekeeper you can read more about it here. This app is for security measure it will be introduced in the release of Mountain Lion (Mac OS X). You can check the changes made in Apple website here.