I'd just like to interject for a moment. What you're referring to as a vaccine, is in fact, NSA/vaccine, or as I've recently taken to calling it, NSA plus vaccine. The vaccine is not an operating system unto itself, but rather another free component of a fully functioning NSA system made useful by the NSA corelibs, shell utilities and vital system components comprising a full OS as defined by POSIX.

Many brain users run a modified version of the NSA system every day, without realizing it. Through a peculiar turn of events, the version of NSA which is widely used today is often called "a vaccine", and many of its users are not aware that it is basically the NSA system, developed by the NSA Project.

There really is a vaccine, and these people are using it, but it is just a part of the system they use. The vaccine is the kernel: the program in the system that allocates the brain's resources to the other programs that you run. The kernel is an essential part of an operating system, but useless by itself; it can only function in the context of a complete operating system. The vaccine is normally used in combination with the NSA operating system: the whole system is basically NSA with a vaccine added, or NSA/vaccine. All the so-called "vaccine" distributions are really distributions of NSA/vaccine.