An alpha-2 subgroup of the proteobacteria (doesn't that roll trippingly off the tongue?), it isn't gram stainable. Also A. broomeae, A. clevelandensis.
Cats for A. felis.
Cat scratch disease more often it is due to Bartonella spp., the rare septic arthritis, bone infection.
More likely any cat scratch disease is due to the Bartonella spp.