] The CDC is still analysing the bacteria responsible for
] these outbreaks. But Bancroft says initial tests show the
] same strain is responsible for all the outbreaks in Los
] Angeles, and that it appears to be the same as a strain
] first isolated in New York in 1997. It may be more
] virulent because it has a gene called PVL, which codes
] for a potent toxin.

More info on the Superbug

New Scientist - Superbug strain hits the healthy